| | fe | | fais |
| | fe | | faith |
| | fe | | Fatal Error |
| | fe | | fee |
| | FEFY | | Fast enough for you |
| | FeRAM | | Ferroelectric RAM |
| | FETLA | | Further Extended Three Letter Acronym |
| | FF | | Forever Friends |
| | FF | | friendly fire |
| | ff&pn | | Fresh Fields and Pastures New |
| | FFA | | Field Force Automation |
| | FFA | | Fre For All |
| | FFA | | Free For All |
| | FFAE | | Friends Forever And Ever |
| | FFIL | | Future Father-in-law |
| | FFO | | Faculty Finance Officer |
| | FFO | | Fixed and Floating Objects |
| | FFO | | fixed-frequency oscillator |
| | FFO | | for food only |
| | FFO | | from financial operations |
| | FFO | | Full fighting order |
| | FFO | | Funds from Operations |
| | FFRD | | Flying f**k in a Rolling Donut |
| | FFST | | Full Flat Square Tube |
| | FFT | | Fast Fourier Transform |
| | FFT | | Frequently Fought Topics |
| | FFTD | | First Full-Term Delivery |
| | FFTFM | | For The Feeble Minded |
| | FFTP | | first full-term pregnancy |
| | ffx | | final fantasy X |
|