Onan is a person in the Biblical Book of Genesis.
Onan may also refer to:
People
- Onan Masaoka, an American Major League Baseball pitcher
- Onan Orlando Thom, a Guyanese swimmer who competed at the 2004 Summer Olympics
- Arzum Onan, a Turkish television actress
- Ömer Onan, a Turkish basketball player
- Ryan O'Nan, an American actor, writer, and director
Other uses
- Ōnan, Shimane, a town in Japan
- Onan, Virginia, an unincorporated community in the U.S. state of Virginia
- Onan, a line of generators manufactured by Cummins Power Systems, a subsidiary of Cummins
- Onan (film), an Indian guerrilla film
- Onan, a canary owned by writer Dorothy Parker, so named because he constantly spilled his seed
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