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Oc
Oca
- Ocagne, Maurice d ' (1862–1938) French engineer and mathematician
- O'Cahan, Richard (1666–1736), British governor of Menorca
- Ocak, Murat (* 1982), Turkish soccer player
- Öçal, Burhan (* 1959), Turkish percussionist and actor
- Öçal, Özgür (* 1981), Turkish soccer player
- Öcalan, Abdullah (* 1949), Turkish leader and former chairman of the Kurdish underground organization PKK
- Öcalan, Dilek (* 1987), Kurdish MP (HDP), niece of Abdullah Öcalan
- Öcalan, Ömer (* 1987), Kurdish-Turkish politician
- Öcalan, Osman (* 1958), Turkish leadership of the PKK
- O'Callaghan Martínez, José (1922–2001), Spanish Jesuit, theologian and papyrologist
- O'Callaghan, Donncha (born 1979), Irish rugby player
- O'Callaghan, John , Irish DJ and music producer
- O'Callaghan, Mike (1929–2004), American politician, Governor of Nevada
- O'Callaghan, Pat (1905-1991), Irish hammer thrower
- O'Callaghan, Xavier (* 1972), Spanish handball manager and handball player
- O'Callahan, Jack (born 1957), American ice hockey player
- O'Callahan, Joseph T. (1905–1964), American Jesuit and military chaplain, recipient of the Medal of Honor
- Ocampo Gaona, Celestino (* 1961), Paraguayan clergyman, Roman Catholic bishop of Carapeguá
- Ocampo Gorostieta, Joel (* 1963), Mexican clergyman and Roman Catholic bishop of Ciudad Altamirano
- Ocampo López, Javier (* 1939), Colombian writer, historian and folklorist
- Ocampo, Felipe (* 1953), Mexican soccer player
- Ocampo, Isidoro (1910–1983), Mexican artist
- Ocampo, Juan Antonio (* 1989), Mexican soccer player
- Ocampo, Juan Ramón (* 1954), Paraguayan football player
- Ocampo, Manuel (* 1965), Filipino painter
- Ocampo, Melchor (1814–1861), Mexican reformist
- Ocampo, Mónica (* 1987), Mexican soccer player
- Ocampo, Pablo (1853–1925), Filipino politician
- Ocampo, Sebastián de , Spanish explorer
- Ocampo, Silvina (1903–1993), Argentine writer
- Ocampo, Victor (* 1952), Filipino clergyman, Bishop of Gumaca
- Ocampo, Victoria (1890–1979), Argentine writer
- Ocampos, Lucas (* 1994), Argentinian soccer player
- Ocampos, Zenón Franco (* 1956), Paraguayan-Spanish chess grandmaster
- Ocaña, Aitana (* 1999), Spanish singer
- Ocaña, Luis (1945–1994), Spanish cyclist
- Ocaranza Carmona, Fernando (1876–1965), Mexican surgeon and rector of the Universidad Nacional Autónoma de México
- Ocáriz Braña, Fernando (* 1944), Spanish clergyman, Roman Catholic theologian and prelate of Opus Dei
- Ocariz, Carlos (* 1971), Venezuelan politician
- O'Carolan, Turlough (1670–1738) Irish composer and harpist
- O'Carroll, Brendan (born 1955), Irish actor, writer and comedian
- Ocasek, Ric , American musician and record producer
- O'Casey, Seán (1880–1964) Irish activist, playwright, and writer
- Ocasio, Cameron (* 1999), American actor
- Ocasio, Ossie (* 1955), Puerto Rican boxer
- Ocasio-Cortez, Alexandria (* 1989), American politician (Democratic Party)
- O'Cathain, Detta, Baroness O'Cathain (* 1938), British manager and politician
Occ
- Occansey, Hugues (born 1966), French basketball player
- Occéan, Olivier (* 1981), Canadian football player
- Occellier, Victor († 1916), American-Canadian singer (baritone)
- Occhetto, Achille (* 1936), Italian politician, member of the Camera dei deputati, MEP
- Occhi, Gilberto (* 1958), Brazilian lawyer, bank president and former minister
- Occhialini, Giuseppe (1907–1993), Italian physicist
- Occhiello, Toni (* 1953), Italian director
- Occhiena, Margareta (1788-1856), mother of Johannes Bosco
- Occhini, Ilaria (1934–2019), Italian actress
- Occhipinti, Giorgio (* 1969), Italian jazz musician and composer
- Occhipinti, Maria (1921–1996), Italian anarchist, communist, writer and suffragette
- Occhiuzzi, Diego (* 1981), Italian saber fencer
- Occo, Adolph (1447–1503), German physician, princely personal physician and humanist
- Occo, Pompeius (1483–1537), Dutch banker and merchant, humanist
- Occom, Samson (1723–1792), Indian, clergyman of the Presbyterian Church (USA)
Oce
- Ocean, Aletta (* 1987), Hungarian porn actress
- Ocean, Billy (born 1950), British pop singer
- Ocean, Danny , Venezuelan Latin pop singer
- Ocean, Frank (* 1987), American R&B musician
- Oceana (* 1982), German soul singer
- Ocelot, Michel (* 1943), French animator
- Očenáš, Andrej (1911–1995), Slovak composer
Ocf
- Ocfort zu Schedling, Ludwig Karl d ' († 1724), General and Minister of War in the Directory of the Braunau Parliament
Oh
- Och, David (* 1980), Swiss author and kidnapping victim
- Och, Franz Josef (* 1971), German computer scientist
- Och, Gunnar (* 1954), German specialist in German
- Och, Sheila (1940–1999), German-Czech children's book author
- Ochab, Edward (1906–1989), Polish politician and general
- Ochaba, Stefan (1904–1948), Austrian composer, choir director and church musician
- Ochabauer, Raimund (1935–2009), Austrian Roman Catholic clergyman
- Ochaim, Brygida (* 1957), German dancer, choreographer and author
- Ochal, Glenn (* 1986), American rower
- Ochal, Paweł (* 1981), Polish marathon runner
- Ochana, Ascher (* 1945), Israeli politician
- Ochard, Jacques-François (1800–1870), French painter
- Oche, Ray Stephen (* 1936), Nigerian musician (trumpet, flute, vocals) of Afrobeat
- Ochel, Hendrik (* 1969), German handball player
- Ochel, Willy (1903–1992), German engineer and manager
- Ochendowskyj, Mychajlo (* 1973), Ukrainian head of the Central Electoral Commission of Ukraine
- Ocher, Mariya (* 1986), Israeli musician, poet, director and artist
- Ochi, Hayato (* 1982), Japanese soccer player
- Ochi, Hideo (* 1940), Japanese karateka, world champion in 1966 and 1967 in Kumite and Kata
- Ochi, Ryōsuke (* 1990), Japanese football player
- Ochi, Takashi (1934–2010), German-Japanese mandolinist and instrumental teacher
- Ochiagha, Gregory Obinna (* 1931), Nigerian clergyman, bishop emeritus of Orlu
- Ochiai, Eiji (1898-1974), Japanese pharmacist
- Ochiai, Hiroshi (born 1946), Japanese football player
- Ochiai, Masayuki (* 1981), Japanese soccer player
- Ochiai, Naobumi (1861–1903), Japanese poet and literary scholar
- Ochiai, Yoshiiku (1833–1904), Japanese painter
- Ochichi, Isabella (* 1979), Kenyan long-distance runner
- Ochieng, Kennedy (* 1971), Kenyan athlete
- Ochiltree, Thomas P. (1837-1902), American politician
- Ochiltree, William Beck (1811-1867), American politician
- Ochino, Bernardino (1487–1564), Italian Reformation theologian
- Ochipinti, Julie , American production designer
- Ochirbat, Gombojaviin (* 1929), Mongolian politician
- Ochiroșii, Răzvan (* 1989), Romanian football player
- Ochitowitsch, Michail Alexandrowitsch (1896–1937), Russian architect
- Ochlik, Rémi (1983–2012), French war photographer
- Ochlobystin, Ivan Ivanovich (* 1966), Russian actor
- Ochlopkow, Nikolai Pawlowitsch (1900–1967), Russian-Soviet actor and theater director
- Ochman, Wiesław (* 1937), Polish opera singer (tenor)
- Ochmann, Bernhard (* 1952), German soccer player
- Ochmann, Johannes († 1418), Bishop of Reval
- Ochmann, Otto (1883–1957), Polish politician (KVP)
- Ochmann, Richard (1918–2008), German lawyer and judge at the Federal Court of Justice
- Ochner, Kurt (* 1953), German fund manager
- Ochner, Nadya (* 1993), Italian snowboarder
- Ochoa Cadavid, Víctor Manuel (* 1962), Colombian Bishop of Cúcuta
- Ochoa de Olza, Iñaki (1967-2008), Spanish extreme mountaineer
- Ochoa Mendoza, Carlos (* 1978), Mexican soccer player
- Ochoa Uribe, Gabriel (1929-2020), Colombian football player and coach
- Ochoa Vásquez, Fabio (* 1957), Colombian drug dealer
- Ochoa, Amparo (1946–1994), Mexican singer
- Ochoa, Armando Xavier (* 1943), American clergyman, emeritus Roman Catholic Bishop of Fresno
- Ochoa, Arnaldo (1930-1989), Cuban general
- Ochoa, Carlos (* 1980), Venezuelan racing cyclist
- Ochoa, Daniel (* 1979), German song, concert and opera singer (baritone)
- Ochoa, David (* 2001), American football goalkeeper
- Ochoa, Eliades (* 1946), Cuban guitarist and singer
- Ochoa, Ellen (* 1958), American astronaut
- Ochoa, Eugenio de (1815–1872), Spanish writer and critic
- Ochoa, Federico (* 1940), Mexican soccer player and coach
- Ochoa, Guillermo (* 1985), Mexican soccer goalkeeper
- Ochoa, Israel (born 1964), Colombian road cyclist
- Ochoa, Juan Cruz (* 1979), Spanish football player
- Ochoa, Lorena (* 1981), Mexican golfer
- Ochoa, Mario (* 1927), Mexican soccer player
- Ochoa, Raymond (* 2001), American actor and voice actor
- Ochoa, Richard (1984–2015), Venezuelan track and road cyclist
- Ochoa, Ryan (* 1996), American actor and voice actor
- Ochoa, Severo (1905-1993) Spanish-American biochemist
- Ochogavía Barahona, Manuel (* 1967), Panamanian religious, Bishop of Colón-Kuna Yala
- Ochoiski, Brian (* 1999), French snooker player
- Ochojska, Janina (* 1955), Polish humanitarian activist, founder of the Polish humanitarian organization PAH
- Ochojski, Nico (* 1999), German-Polish soccer player
- Ochola, Yovan (* 1938), Ugandan shot putter, hammer thrower and discus thrower
- Ocholi, Edicha (* 1979), Nigerian badminton player
- Okhotin, Lev Pavlovich (1911–1948), Russian fascist
- Ochotorena, José Manuel (* 1961), Spanish football goalkeeper
- Ochowicz, Elli (* 1983), American speed skater
- Ochowicz, Jim (* 1951), American cyclist and cycling official
- Ochozimski, Dmitri Evgenjewitsch (1921–2005), Russian physicist, mathematician and university professor
- Ochs von Ochsenstein, Johann Christoph (1674–1747), Frankfurt patrician and politician
- Ochs, Adam Ludwig von (1759–1823), Major General of the Electorate of Hesse and diplomat
- Ochs, Adolph (1858-1935), American reporter, owner of the New York Times
- Ochs, Carl (1812–1873), German Protestant missionary
- Ochs, Carl von (1794–1846), Major General of the Electorate of Hesse, politician and member of parliament
- Ochs, Deborah (* 1966), American archer
- Ochs, Erich (1883–1951), German university professor and conductor
- Ochs, Ernst (1888–1961), German Germanist and long-time editor of the Baden dictionary
- Ochs, Eugen (1905–1990), German communist and trade unionist
- Ochs, Ferdinand (1824–1879), German administrative officer
- Ochs, Georg (1886–1971), German entomologist
- Ochs, Gerhard (* 1944), German writer
- Ochs, Gustav (1825–1858), German landscape painter from the Düsseldorf School
- Ochs, Hans Abraham (1928–1936), German victim of a Nazi violent crime
- Ochs, Hans Dieter (* 1936), German immunologist
- Ochs, Jacob (1871–1927), German gardener
- Ochs, Jacques (1883–1971), Belgian caricaturist and Olympic champion
- Ochs, Josef (1905–1987), German detective and SS-Obersturmführer
- Ochs, Karl Wilhelm (1896–1988), German architect and university professor
- Ochs, Klaus-Dieter (1939–2015), German football coach
- Ochs, Kurt (* 1922), German handball player
- Ochs, Larry (* 1949), American jazz saxophonist and composer
- Ochs, Patrick (* 1984), German soccer player
- Ochs, Peter (1752–1821), Swiss politician
- Ochs, Peter Paul (1931–1994), German-Canadian painter and sculptor
- Ochs, Phil (1940–1976), American singer, songwriter and political activist
- Ochs, Philipp (* 1997), German soccer player
- Ochs, Robyn (* 1958), American educator and activist of the bi-movement
- Ochs, Siegfried (1858–1929), German choir director and composer
- Ochs, Stephanie (* 1990), American soccer player
- Ochs, Timo (* 1981), German soccer goalkeeper
- Ochs, Traugott (1854–1919), German court music director, organist and conductor
- Ochs, Volker (1929–2018), German composer
- Ochs, Walter (1912–1991), German football player and coach
- Ochsé, Fernand (1879–1944), French artist
- Ochse, Hildegard (1935–1997), German photographer
- Ochsé, Julien (1874–1936), French writer
- Ochsé, Louise (1884–1944), Belgian sculptor
- Ochsenbach, Hans Hermann (1558–1621), Burgvogt of Tübingen
- Ochsenbauer, Leo (1967–2015), Austrian author and journalist
- Ochsenbein, Peter (1940–2003), Swiss Medievalist and Abbey Librarian in St. Gallen
- Ochsenbein, Ulrich (1811–1890), Swiss politician and general
- Ochsenbruck, Andreas , goldsmith
- Ochsenfeld, Christian (* 1968), German chemist
- Ochsenfeld, Robert (1901–1993), German physicist
- Ochsenheimer, Ferdinand (1767–1822), German actor and lepidopterist (butterfly scientist)
- Ochsenheimer, Magdalena , German theater actress
- Ochsenhofer, Hannes (* 1985), Austrian basketball player
- Ochsenius, Carl (1830–1906), German geologist
- Ochsenknecht, Falko (* 1987), German actor and pop singer
- Ochsenknecht, Jimi Blue (* 1991), German actor
- Ochsenknecht, Natascha (* 1964), German actress, author and model
- Ochsenknecht, Uwe (* 1956), German actor and singer
- Ochsenknecht, Wilson Gonzalez (* 1990), German actor
- Ochsenkun, Sebastian (1521–1574), German lutenist and composer
- Ochsenreiter, Hermann (1846–1922), German pharmacist
- Ochsenreiter, Manuel (* 1976), German journalist
- Ochsenstein, Johann (1331–1386), led the Habsburgs as field captain under Leopold III.
- Öchsl, Jörg , Austrian master builder of St. Stephen's Cathedral
- Öchsle, Uwe (1941–2007), German soccer player
- Ochsner, Cedric (* 1998), Swiss ski racer
- Ochsner, Heinrich (1891–1970), German philosopher and publisher's editor
- Ochsner, Hermann (1892–1951), German officer
- Ochsner, Karl (* 1946), Austrian entrepreneur
- Ochsner, Martin (1862–1939), Swiss politician (KVP / CVP)
- Öchsner, Michael (1816–1893), Bavarian teacher, publicist and writer
- Ochtervelt, Jacob Lucasz (1634–1682), Dutch Baroque painter
- Ochwadt, Curd (1923–2012), German writer, translator, editor and publisher
- Ochyra, Emil (1936–1980), Polish saber fencer
Oci
- Očić, Ljerka (* 1960), Croatian organist
- Ociepka, Teofil (1891–1978), Polish painter, theosophist, leader of the Janów occult community
- Ocik, Hannes (* 1991), German rower
- Ocio, Aitor (* 1976), Spanish football player
Ock
- Ockeghem, Johannes († 1497), Flemish composer, singer and cleric
- Ockel, Eduard (1834–1910), German painter
- Ockel, Ernst Friedrich (1742–1816), German-Baltic clergyman
- Ockelmann, Robert (1849–1915), German sculptor
- Ockeloen, Jasper (* 1990), Dutch cyclocross and road cyclist
- Ockels, Wubbo (1946–2014), Dutch physicist and spaceman
- Ocken, Rolf Theo (* 1939), retired German major general D.
- Ockenden, Leon (* 1978), British actor, director and author
- Ockenfels, Axel (* 1969), German economist
- Ockenfels, Gerhard (* 1954), German soccer player
- Ockenfels, Hans Michael (* 1966), German dermatologist and allergist
- Ockenfels, Wolfgang (* 1947), German religious, theologian and social ethicist
- Ockenga, Harold John (1905–1985), American evangelical pastor, co-founder of Fuller Theological Seminary
- Ockenga, Norbert (* 1971), German journalist, publisher and television commentator
- Ocker, Claus (1923-2015), German classical singer (baritone)
- Ocker, Julia (* 1982), German animation director, designer and author
- Ocker, Karsten (1945–2015), German military, inspector of the Bundeswehr medical service
- Ockermüller, Franz (1915–1976), Austrian banking specialist
- Ockermüller, Heinz (1921–1994), Austrian set designer and film architect
- Ockermüller, Kurt (* 1948), Austrian director
- Ockers, Stan (1920–1956), Belgian racing cyclist
- Ockers, Tom (* 1962), German journalist and filmmaker
- Ockerse, Taco (* 1955), Dutch musician
- Ockert, Carl Friedrich (1825–1899), German landscape, hunting and animal painter
- Ockert, Erich (1889–1953), German painter and graphic artist
- Ockert, Frank (* 1968), German soccer player
- Ockert, Matthias (* 1970), German composer and guitarist
- Ockett, Molly († 1816), Abenaki healer
- Ockley, William , alleged murderer of Edward II.
- Ockrent, Christine (* 1944), French journalist
Ocl
- Oclatinius Adventus, Marcus , Roman consul 218 and Praetorian prefect
- Oclatius Severus, Tiberius , Roman suffect consul (160)
- Ocleppo, Gianni (* 1957), Italian tennis player
- Ocleppo, Julian (* 1997), Italian tennis player
- Ocloo, Esther Afua (1919–2002), Ghanaian entrepreneur
Ocn
- Ocneanu, Adrian , Romanian-American mathematician
Oco
- Ocokoljić, Predrag (* 1977), Serbian football player
- Ocokoljić, Slobodan (* 1980), Serbian basketball player
- Ocon, Esteban (* 1996), French racing car driver
- O'Connell, Anthony Joseph (1938–2012), American clergyman, Roman Catholic bishop
- O'Connell, Arthur (1908–1981), American actor
- O'Connell, Bill (* 1953), American jazz musician (piano)
- O'Connell, Brittany (* 1972), American porn actress
- O'Connell, Carol (* 1947), American crime novelist
- O'Connell, Christopher (* 1994), Australian tennis player
- O'Connell, DP (1924–1979), New Zealand lawyer and Chichele Professor of International Law at Oxford
- O'Connell, Daniel (1775-1847), Irish freedom fighter
- O'Connell, Darragh , Irish film producer
- O'Connell, David G. (* 1953), Irish clergyman, auxiliary bishop in Los Angeles
- O'Connell, David J. (1868–1930) American politician
- O'Connell, David Michael (* 1955), American religious, Bishop of Trenton
- O'Connell, Denis Joseph (1849–1927) Irish clergyman, Bishop of Richmond
- O'Connell, Eoghan (born 1995), Irish football player
- O'Connell, Finneas (* 1997), American singer-songwriter , record producer and actor
- O'Connell, Frédérique Émilie Auguste (1822–1885), German painter and etcher
- O'Connell, Helen (1920–1993), American singer and actress
- O'Connell, Helen (born 1962), Australian urologist
- O'Connell, Jack (born 1990), British actor
- O'Connell, Jeremiah E. (1883–1964), American politician
- O'Connell, Jerry (* 1974), American actor
- O'Connell, Jerry J. (1909–1956), American politician
- O'Connell, Jessica (* 1989), Canadian long-distance runner
- O'Connell, John († 2013), Irish politician, MEP
- O'Connell, John Matthew (1872–1941), American politician
- O'Connell, Johnny (* 1962), American racing car driver
- O'Connell, Joseph F. (1872–1942), American politician
- O'Connell, Joseph Peter (1931–2013), Australian clergyman, Roman Catholic bishop
- O'Connell, Kevin (* 1957), American sound engineer
- O'Connell, Les (* 1958), New Zealand rower
- O'Connell, Mark (* 1964), Canadian clergyman and Roman Catholic auxiliary bishop in Boston
- O'Connell, Martin (1916–2003), Canadian economist, professor, and politician with the Liberal Party of Canada
- O'Connell, Mike (* 1955), American ice hockey player, coach and official
- O'Connell, Pamela Eells (* 1958), American television producer, director and screenwriter
- O'Connell, Patrick (1887-1959) Irish football player and coach
- O'Connell, Paul (born 1979), Irish rugby player
- O'Connell, Ryan (* 1986), American author, actor and film producer
- O'Connell, Seamus (1930-2013), English football player
- O'Connell, Stuart France (1935–2019), New Zealand clergyman, Roman Catholic Bishop of Rarotonga
- O'Connell, William Henry (1859–1944), American clergyman, Archbishop of Boston, and Cardinal
- O'Connor, Anthony (born 1992), Irish football player
- O'Connor, Art (1888-1950), Irish politician (Sinn Féin)
- O'Connor, Barry , English squash player
- O'Connor, Basil (1892–1972), American lawyer and philanthropist
- O'Connor, Ben (* 1988), British ice hockey player
- O'Connor, Ben (* 1995), Australian cyclist
- O'Connor, Bob (1944-2006), American politician (Democratic Party)
- O'Connor, Brenock (* 2000), British actor
- O'Connor, Bridget (1961-2010) British playwright and screenwriter
- O'Connor, Bryan D. (* 1946), American astronaut
- O'Connor, Buddy (1916–1977), Canadian ice hockey player
- O'Connor, Carroll (1924-2001), American actor
- O'Connor, Charles (1843–1902) Irish-Australian engineer, builder of the Port of Fremantle and the Golden Pipeline
- O'Connor, Charles (1878–1940), American politician
- O'Connor, Cian (* 1979), Irish show jumper
- O'Connor, Colleen (* 1951), American figure skater
- O'Connor, David (* 1962), American eventing rider
- O'Connor, David Kevin (* 1957), American philosopher
- O'Connor, Debra (* 1966), Jamaican badminton player from Trinidad and Tobago
- O'Connor, Denis T. (1841-1911), Canadian Roman Catholic clergyman and Archbishop of Toronto
- O'Connor, Derrick (1941-2018), Irish actor
- O'Connor, Des (born 1932), English entertainer and singer
- O'Connor, Donald (1925–2003), American actor and dancer
- O'Connor, Edwin (1918–1968), American writer
- O'Connor, Flannery (1925–1964), American writer
- O'Connor, Frances (* 1967), British-Australian actress
- O'Connor, Frances Belle (1914–1982), American film actress and circus artist
- O'Connor, Francis Valentine (1937-2017), American art historian
- O'Connor, Francisco Burdett (1791–1871), officer in the Irish Legion in Simón Bolívar's army
- O'Connor, Frank (1903-1966) Irish writer
- O'Connor, Garry (born 1983), Scottish soccer player
- O'Connor, Gavin (* 1964), American film director, screenwriter, film producer and actor
- O'Connor, Gemma (born 1940), Irish writer
- O'Connor, Glynnis (born 1956), American actress
- O'Connor, Gordon (* 1939), Canadian brigadier general and politician
- O'Connor, Hazel (born 1955), British singer and actress
- O'Connor, Hubert Patrick (1928–2007) Canadian clergyman, Bishop of Prince George, British Columbia, Canada
- O'Connor, James (1870–1941) American politician
- O'Connor, James (born 1979), Irish football player
- O'Connor, James (* 1984), English soccer player
- O'Connor, James F. (1878–1945), American politician
- O'Connor, Jim , Irish film producer
- O'Connor, Joe (* 1995), English snooker player
- O'Connor, John J. (1885–1960), American lawyer and politician
- O'Connor, John J. (1933–2009), American journalist and film critic
- O'Connor, John Joseph (1855–1927) American Roman Catholic Bishop of Newark
- O'Connor, John Joseph (1920–2000), American Roman Catholic Cardinal and Archbishop of New York
- O'Connor, Joseph (born 1963), Irish writer
- O'Connor, Josh (born 1990), British film actor
- O'Connor, Kelley , American opera singer (mezzo-soprano)
- O'Connor, Kent (born 1987), Canadian football player
- O'Connor, Kevin , American basketball official
- O'Connor, Kevin (1929–1993) British Roman Catholic clergyman and auxiliary bishop in Liverpool
- O'Connor, Kevin (* 1985), Irish football player
- O'Connor, Kevin J. (born 1963), American actor
- O'Connor, Larry (1916–1995) Canadian hurdler and sprinter
- O'Connor, Maggie , American violinist, fiddle player and singer
- O'Connor, Mark (born 1945), Australian poet
- O'Connor, Mark (* 1961), American violinist, fiddle player, guitarist, mandolin player, composer and music teacher
- O'Connor, Martin John (1900–1986), American Curia Archbishop and first president of the Pontifical Commission on Social Communications
- O'Connor, Maureen (* 1951), American politician and lawyer
- O'Connor, Michael (* 1965), British costume designer
- O'Connor, Michael P. (1831-1881) American politician
- O'Connor, Miikka (* 1996), Finnish table tennis player
- O'Connor, Pat (1928-1958), American racing driver
- O'Connor, Pat (born 1943), Irish director
- O'Connor, Patrick (born 1966), Jamaican sprinter
- O'Connor, Patrick Edward (1932-2014), New Zealand clergyman, Emeritus Apostolic Superior of Tokelau
- O'Connor, Peter (1872-1957) Irish athlete
- O'Connor, Renée (* 1971), American actress
- O'Connor, Richard (1889-1981) British general
- O'Connor, Richard (* 1978), Anguilla football player
- O'Connor, Robert (* 1959), American writer
- O'Connor, Rory (1883-1922), Irish freedom fighter
- O'Connor, Sandra Day (* 1930), American lawyer, US Supreme Court Justice
- O'Connor, Sarah , American natural product chemist
- O'Connor, Seamus (born 1997), Irish snowboarder
- O'Connor, Sean (* 1981), Canadian-German ice hockey player
- O'Connor, Sean (* 1987), American ice hockey player
- O'Connor, Sheila (born 1966), French actress
- O'Connor, Sinéad (* 1966), Irish musician and singer
- O'Connor, Siobhan-Marie (* 1995), British swimmer
- O'Connor, Sixtus (1909–1983), American priest and pastor of Catholic prison inmates during the Nuremberg Trial of the main war criminals
- O'Connor, Stefan (* 1997), English soccer player
- O'Connor, Sue , Australian archaeologist
- O'Connor, Susan (* 1977), Canadian curler
- O'Connor, Terence (1891-1940) British Conservative politician
- O'Connor, Tim (1927-2018), American actor
- O'Connor, Una (1880-1959) Irish actress
- O'Connor, William (* 1986), Irish darts player
- O'Connor, William Aloysius (1903–1983), American clergyman and Roman Catholic Bishop of Springfield, Illinois
- O'Connor, William Scott (1864-1939), American fencer
- O'Connor-Connolly, Juliana (* 1961), British Speaker of the Cayman Islands Parliament
- O'Conor, Herbert (1896–1960) American politician, Governor of Maryland
- O'Conor, Hugh (born 1975), Irish actor
- O'Conor, John (* 1947), Irish pianist and piano teacher
- O'Conor, Roderic (1860-1940) Irish painter
- Oconostota , Cherokee chief
Ocr
- Ocran, Albert Kwesi , Ghanaian military and politician
Ocs
- Ocskay von Ocskö, Franz (1775-1851), Hungarian entomologist
- Ocskay, Gábor (1975–2009), Hungarian ice hockey player
- Ocskó, László (* 1962), Hungarian badminton player
Oct
- Octavia (40–62), daughter of the Roman emperor Claudius
- Octavia Maior , sister of Augustus, wife of Sextus Appuleius
- Octavia Minor († 11 BC), Roman woman, wife of Mark Antony
- Octavian (* 1996), English-French rapper
- Octavius Fronto, Sextus , Roman suffect consul (86) and governor
- Octavius Laenas Pontianus, Sergius , Roman Consul (131)
- Octavius Rufus, Gnaeus , Roman politician, quaestor probably 230 BC Chr.
- Octavius of Great Britain, Ireland and Hanover (1779–1783), member of the British royal family from the House of Hanover
- Octavius, Gaius , Roman politician, father of the Emperor Augustus
- Octavius, Gnaeus († 87 BC), Roman politician, consul 87 BC Chr.
- Octavius, Gnaeus , Roman politician, praetor 205 BC Chr.
- Octavius, Gnaeus († 162 BC), Roman politician, consul 165 BC Chr.
- Octavius, Gnaeus , Roman politician, consul 128 BC Chr.
- Octavius, Gnaeus , Roman politician, consul 76 BC. Chr.
- Octavius, Lucius († 74 BC), Roman politician, consul 75 BC. Chr.
- Octavius, Marcus , Roman politician and tribune
- Octavius, Marcus , Roman politician, tribune 133 BC Chr.
- Octavius, Marcus , Roman politician, aedile 50 BC Chr.
- Octo Octa (* 1987), American music producer and DJ
Ocu
- O'Cuire Quirke, Hella , German writer
- Ocuish, Hannah (1774–1786), youngest person to be sentenced to death by American justice
- Oculi, Okello (* 1942), Ugandan writer and political scientist
- O'Curry, Eugene (1794-1862) Irish university professor
Ocw
- Oc Wirk, Ernst (1926–1980), Austrian soccer player and soccer coach
- Ocffekt, Martha (1925–2006), Austrian handball player
Ocz
- Oczipka, Bastian (* 1989), German soccer player