| O3 Medya | — | — | 1 |
| Oakshire Productions | — | — | 1 |
| Oberon Cinematogràfica | Barcelona | 1990 | 1 |
| Objectif 9 | — | — | 1 |
| Objectiv Filmstudio | — | — | 1 |
| Oceania Produzioni Internazionali Cinematografiche | — | — | 1 |
| Oceanic Preservation Society | Colorado | 2005 | 1 |
| OCS | — | January 7, 1991 | 1 |
| OddLot Entertainment | Culver City | 2001 | 1 |
| Odeon | — | — | 1 |
| Olympic | — | 1962 | 1 |
| Omnia Film | Munich | — | 1 |
| Omroep MAX | Hilversum | 2002 | 1 |
| One Fine Day Films | Berlin | 2008 | 1 |
| Open de España | — | 1912 | 1 |
| Optimystix Entertainment | Mumbai | 2000 | 1 |
| Orange | Issy-les-Moulineaux | 1988 | 1 |
| Orange Cinéma Séries | Paris | November 13, 2008 | 1 |
| Orange Studio | Issy-les-Moulineaux | October 22, 2001 | 1 |
| Orbis, Rhineland-Palatinate | — | — | 1 |
| Orlando Film Festival | — | 2005 | 1 |
| Otomatic | — | — | 1 |
| Ouille Productions | Neuilly-sur-Seine | 1996 | 1 |
| Outspoken Media | New York City | 2004 | 1 |
| P4 Theater | Beijing | June 4, 2016 | 1 |
| Pacific Street Films | Brooklyn | 1969 | 1 |
| Palace Complex | — | 1899 | 1 |
| Paladin Production | Paris | — | 1 |
| PAN-Film | — | 1944 | 1 |
| Panorama Film Studios | — | — | 1 |
| Pantera Film | Berlin | — | 1 |
| Paradox Rettigheter | Lillehammer | August 24, 1998 | 1 |
| Parallel Universe | — | June 2012 | 1 |
| Paramount Famous Productions | Hollywood | 2007 | 1 |
| Paramount Networks Americas | Miami Beach | 1993 | 1 |
| Parco Film | — | — | 1 |
| PBOUL Borisevich R.U | — | — | 1 |
| Peace Arch Entertainment | Toronto | 1981 | 1 |
| Pen N Camera International | Mumbai | 1977 | 1 |
| Pen Pusher production | Lagos | — | 1 |
| Penn/Bright Entertainment | — | — | 1 |
| Penned Pictures | Penzberg | 2018 | 1 |
| Pentamedia Graphics | — | — | 1 |
| PepFilmStudios | Oakland | — | 1 |
| Pepito Produzioni | Rome | 2011 | 1 |
| Perathon Film und Fernseh GmbH | Grünwald | — | 1 |
| Perişan Film | — | — | 1 |
| Permtelefilm | Perm | 1965 | 1 |