| FIF | an amendment to the Constitution of the United States that imposes restrictions on the government's prosecution of persons accused of crimes |
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| FIF | an avenue in Manhattan that separates the East Side of Manhattan from the West Side |
| FIF | a subversive group that supports the enemy and engages in espionage or sabotage |
| FIF | a member of a clandestine subversive organization who tries to help a potential invader |
| FIF | the main sensory nerve of the face and motor nerve for the muscles of mastication |
| FIF | a Crusade under papal control from 1218 to 1221 that achieved military victories but failed when dissension arose over accepting the terms they had been offered |
| FIF | a fifth part |
| FIF | a steering bearing that enables the front axle of a horse-drawn wagon to rotate |
| FIF | an extra car wheel and tire |
| FIF | in the fifth place |
| FIF | the time of life between 50 and 60 |
| FIF | the decade from 1950 to 1959 |