Onnen
Onnen is the family name of the following people:
- Alfred Onnen (1904–1966), German lawyer and politician (FDP), Member of the Bundestag
- Eike Onnen (* 1982), German athlete
- Gerrit Onnen (* 1873 in Leer - 1948 in Backnang ), German painter
- Imke Onnen (* 1994), German high jumper
- Robert Onnen (1887–1968), German politician (SPD)