FF1 may refer to:
- Mozilla Firefox
- Fantastic Four (2005 Film), the first movie in the Fantastic Four series
- Fatal Frame (Video Game), the first game in the Fatal Frame series
- Final Fantasy (video game), the first game in the Final Fantasy series
- Final Fight (Video Game), the first game in the Final Fight series
- Fatal Fury: King of Fighters, the first game in the Fatal Fury series
- PRR FF1, a locomotive of the Pennsylvania Railroad
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