| | fcfs | | first come first served |
| | fcfs | | first come, first served |
| | FCL | | full container load |
| | fcol | | for crying out loud |
| | fcol | | for crying outloud |
| | FCS | | First Customer Ship |
| | fd | | find |
| | fd | | Floppy Disk |
| | FDA | | Food and Drug Administration |
| | FDAU | | Face Down Ass Up |
| | FDD | | feature driven development |
| | FDD | | floppy disk drive |
| | FDD | | frequency division duplexing |
| | FDGB | | Fall Down Go Boom |
| | FDI | | Foreign Direct Investment |
| | FDLOL | | Falling Down, Laughing Out Loud |
| | FDOI | | first day of issue |
| | FDOTFL | | falling down on the floor laughing |
| | fdrofl | | falling down, rolling on floor laughing |
| | FDROTFL | | falling down rolling on the floor laughing |
| | FDRT | | field division routing table |
| | fdts | | f**k the dumb sh*t |
| | 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 |
| | FFA | | Field Force Automation |
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