- Operation Mekong (2016)
- Operation Pacific (1951)
- Operation Petticoat (1959)
- Operation Red Sea (2018)
- Operation Rogue (2014)
- Operation Wedding (2013)
- Operation Welcome Home (1991)
- Operator (2015)
- Operator 13 (1934)
- Ophelia (2018)
- Opinions (1984)
- Opium War (2008)
- Opposing Force (1986)
- Opposite Day (2009)
- Opposite of Sex, The (1998)
- Opposite The Opposite Blood (2018)
- Optimisti (2006)