FF1 (disambiguation)

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