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O
- Ó Briain, Dara (* 1972), Irish stand-up comedian and television presenter
- Ó Brolcháin, Niall , Irish politician
- Ó Buachalla, Liam (1899–1970), Irish politician
- Ó Cadhain, Máirtín (1906–1970), Irish writer, literary critic and political commentator
- Ó Ceallaigh, Fiachra (1933–2018), Irish clergyman, Roman Catholic bishop
- Ó Ceallaigh, Seán (1882–1966), Irish politician, second President of Ireland (1945–1959)
- Ó Cearnaigh, Colbert (born 1945), Irish author
- Ó Conaire, Pádraic (1882–1928), Irish writer and journalist
- Ó Criomhthain, Tomás (1856–1937), Irish author, one of the last natives on the Blasket Islands
- Ó Cuív, Éamon (born 1950), Irish politician (Fianna Fáil)
- Ó Dálaigh, Cearbhall (1911–1978), Irish lawyer, President of Ireland
- Ó Direáin, Máirtín (1910–1988), Irish writer
- Ó Domhnaill, Brian (* 1977), Irish politician
- Ó Domhnaill, Niall Garbh (1560–1626), member of the O'Donnell clan of Donegal
- Ó Faoláin, Seán (1900–1991), Irish writer
- Ó Fiaich, Tomás Séamus (1923–1990), Northern Irish clergyman, Archbishop of Armagh and Cardinal of the Roman Catholic Church
- Ó Grianna, Séamus († 1969), Irish writer and translator
- Ó hAnnracháin, Peadar (1873–1965), Irish writer and playwright
- Ó Héalaí, Dónall (* 1987), Irish film actor and voice actor
- Ó hÉideáin, Seán , Irish diplomat
- Ó hEithir, Breandán (1930–1990), Irish writer and journalist
- Ó hUiginn, Mícheál (born 1942), Irish politician, Mayor of Galway
- Ó hUiginn, Seán , Irish diplomat
- Ó Muirí, Naoise , Irish politician (343rd Lord Mayor of Dublin)
- Ó Murchú, Labhrás , Irish politician
- Ó Neachtain, Seán (* 1947), Irish politician (Fianna Fáil), MEP
- Ó Néill, Aodh Mór, 2nd Earl of Tyrone († 1616), head of the Irish clan
- Ó Néill, Eoghan Rua (1590–1649), Irish rebel leader
- Ō no Yasumaro († 723), Japanese court official and scholar
- Ó Riada, Seán (1931–1971), Irish composer
- Ó Riain, Pádraig (* 1939), Irish Celtologist and hagiologist
- Ó Séaghdha, Darach , Irish writer and podcaster
- Ó Searcaigh, Cathal (born 1956), Irish writer, poet and playwright
- Ó Siadhail, Eoghan (1584–1650), military doctor
- Ó Súilleabháin, Diarmaid (1932–1985), Irish writer
- Ó Súilleabháin, Mícheál (1950–2018), Irish pianist and composer
- O, Cédric (* 1982), French politician and State Secretary
- O, Chin-u (1917–1995), North Korean marshal and politician
- O, François d ' († 1594), Mignon of the French King Henry III.
- O, Henry (* 1927), Chinese actor
- O, Karen (* 1978), American singer and musician
- O, Kŭng-nyŏl (* 1931), North Korean lieutenant general and politician
- O, Sang-hon († 2014), North Korean politician
- Ó, Vicente Alves do (* 1972), Portuguese screenwriter and director
- O-Jay (* 1965), German songwriter, music producer and rapper
- O-Shen (* 1978), Papua New Guinea musician
- OG Style (1970-2008), American rapper
- O., Dore (* 1946), German filmmaker, painter and photographer
- O., Martin (* 1975), Swiss vocal artist, beatboxer and musician
- O., Rachid (* 1970), Moroccan author
- OC (born 1972), American rapper
- OSTR (* 1980), Polish rapper