- The Omen (1976)
R | Horror/Thriller
- The Omen (2006)
R | Horror
- Open Water (2003)
R | Drama/Horror
- Onslaught (2026)
R | Action/Horror
- Organ Trail (2023)
R | Horror/Western
- Oddity (2024)
R | Horror
- The Oblong Box (1969)
R | Horror
- Outpost (2008)
R | Action/Horror
- Opus (2025)
R | Comedy/Horror
- Obsession (2026)
R | Horror/Thriller
- The Oracle
R | Horror
- Overlord (2018)
R | Action/Horror
- Opera (1991)
R | Horror/Thriller
- One Missed Call (2003)
R | Horror/Thriller
- Oily Maniac
NR | Horror
- Occult Bolshevism (2018)
NR | Horror
- One Cut of the Dead (2019)
NR | Comedy/Horror
- The Occupant
NR | Horror/Thriller
- Open Grave (2014)
NR | Horror
- Ox-Head Village (2022)
NR | Horror
- Offseason (2021)
NR | Horror/Thriller
- Oscar Tango Hellwater
NR | Horror
- Onyx the Fortuitous and the Talisman of Souls (2023)
NR | Comedy/Horror
- The Outwaters (2022)
NR | Horror/Thriller
- Old Habits Die Hard
NR | Horror
- The Other
NR | Horror/Thriller
- The Occupants (2014)
NR | Horror/Thriller
- Omnivores (2013)
NR | Horror/Thriller
- Operation Undead (2025)
NR | Drama/Horror
- Ouija 4 (2015)
NR | Horror
- The Orchard
NR | Horror
- The Other Lamb (2020)
NR | Drama/Horror
- Odd Thomas (2013)
NR | Romance/Horror
- One Missed Call: Final (2009)
NR | Horror/Thriller
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