- O Som e a Fúria 5 films
- Oberón Cinematográfica S.A. 4 films
- October Media One film
- Octopolis 3 films
- Oddfellows Entertainment One film
- Odeon Media Entertaintment One film
- Off Camera Entertainment One film
- Off Ecam
- Office Kitano 3 films
- Offscreen One film
- Offspring Entertainment 4 films
- Oh My Gomez! 4 films
- Ojú Producciones One film
- Okta Film One film
- OLAH Films One film
- Olga Film One film
- Olga Film GmbH 3 films
- Oliete Films 7 films
- Olive Bridge Entertainment 4 films
- OLM, Inc. 14 films
- Olwyn Films 3 films
- Olympus Pictures 4 films
- Omega Project One film
- OmniCorp Estudio One film
- On pictures 9 films
- ONE TWO Films 5 films
- Onirica Films One film
- Onirikal One film
- Ontario Creates 2 films
- OPE Partners One film
- Open River Entertainment One film
- Open Road Films 5 films
- Open Window Productions One film
- Optimum Releasing One film
- Opus Films 6 films
- Orange Studios 21 films
- Orca Films One film
- Original Film 35 films
- Orion Pictures 40 films
- Orogen Entertainment One film
- Orsai Cine One film
- Oscilloscope Laboratories 2 films
- Österreichischer Rundfunk (ORF) One film
- Otto Preminger Films 2 films
- Outer Lumen One film
- Outerbanks Entertainment 2 films
- Outplay Films
- Overbrook Entertainment 6 films
- Overture Films 5 films
- Ovídeo TV S.A. One film
- Oxwich Media One film
- Oxybot One film
- Oy Art Film Producing Company One film
- Ozla Pictures 3 films