- Open Water (2003)
R | Drama/Horror
- Outbreak (1995)
R | Drama/Action
- One Missed Call 2 (2005)
R | Horror/Thriller
- One Missed Call (2003)
R | Horror/Thriller
- Overlord (2018)
R | Action/Horror
- The Oracle
R | Horror
- Oracle
R | Horror
- Oddity (2024)
R | Horror
- Opus (2025)
R | Comedy/Horror
- The Oblong Box (1969)
R | Horror
- Oily Maniac
NR | Horror
- Obras maestras del terror
NR | Horror/Fantasy
- Offseason (2021)
NR | Horror/Thriller
- Odd Thomas (2013)
NR | Romance/Horror
- The Other Lamb (2020)
NR | Drama/Horror
- One Missed Call: Final (2009)
NR | Horror/Thriller
- The Other
NR | Horror/Thriller
- Open Grave (2014)
NR | Horror
- One Cut of the Dead (2019)
NR | Comedy/Horror