- Olafur Darri Olafsson (4 movies)
- Ola Sturik (1 movie)
- Ola Ray (1 movie)
- Okwui Okpokwasili (1 movie)
- Okwar Jale (1 movie)
- Oksana Akinshina (1 movie)
- Okan Avci (1 movie)
- Ohga Tanaka (1 movie)
- Og Blood (1 movie)
- Ofilio Portillo (1 movie)
- Ofield Williams (2 movies)
- Ofelia Medina (1 movie)
- Odnyam Odsuren (1 movie)
- Odine Johne (1 movie)
- Odeya Rush (2 movies)
- Odette Annable (3 movies)
- Odessa Sykes (1 movie)
- Odessa Rae (1 movie)
- Odessa Munroe (1 movie)
- Oded Fehr (5 movies)
- Odd-Magnus Williamson (1 movie)
- Octavian Cadia (1 movie)
- Octavia Spencer (10 movies)
- Obba Babatunde (1 movie)
- Oakley Lehman (1 movie)
- Oakes Fegley (1 movie)
- O'Shea Jackson Jr. (1 movie)
- O'Clair Alexander (1 movie)
- Nzinga Blake (1 movie)
- Nyasha Hatendi (1 movie)
- Nurzhuman Ikhtymbayev (1 movie)
- Ntare Guma Mbaho Mwine (1 movie)
- Nozomi Linus Kaisar (1 movie)
- Novica Todorovic (1 movie)
- Novella Nelson (1 movie)
- Noureen DeWulf (4 movies)
- Norwich Duff (1 movie)
- Norman Yeung (1 movie)
- Norman Vincent McLafferty (1 movie)
- Norman Reedus (7 movies)
- Norman Marolt (1 movie)
- Norman Lloyd (1 movie)
- Norman Kaye (1 movie)
- Norman Chancer (1 movie)
- Norman Burton (3 movies)
- Norman Alden (1 movie)
- Norma Varden (1 movie)
- Norma Michaels (1 movie)
- Norma Atallah (1 movie)
- Norma Alvarez (1 movie)