O
- Obsession (born 1976), American pornographic actress
- Oceana (born 1982), German singer
- Octagón (born 1961), Mexican wrestler
- Octagóncito (born 1973), Mexican wrestler
- Octahvia, American singer
- Odetta (1930–2008), American singer-songwriter, guitarist and actress
- Ogeday (born 1981), Turkish rap singer
- Olímpico (born 1965), Mexican wrestler
- Oliver (1945–2000), American singer
- Olivia (born 1979), Japanese American singer-songwriter
- Olivia (born 1980), American singer
- Olunike (born 1977), Canadian actress
- Omarion (born 1984), American singer-songwriter, actor, dancer and producer
- Omnionn, Salvadoran music producer
- Oneya (born 1979), Serbian hip hop producer
- Onyx, American wrestler
- Oosie, Nigerian rapper
- Orelsan (born 1982), French hip hop and rap artist
- Orianthi (born 1985), Australian singer-songwriter and guitarist
- Origa (born 1970), Russian Japanese singer
- Oscarito (1906–1970), Brazilian actor and comedian
- Osez, Swiss rapper and dancer
- Outsider (born 1983), South Korean rapper
- Ovidie, French director, producer and pornographic actress
Read more about this topic: List Of One-word Stage Names