- FAL File Access Listener
- FAQ Frequently Asked Question
- FAQs Frequently Asked Questions
- FAT File Allocation Table
- FCBS File Control BlockS
- FCC Federal Communications Commission
- FCI Frame Copied Indicator Bit
- FCS Frame Check Sequence
- FDDI Fiber Data Distributed Interface / Fiber Distributed Data Interconnect
- FDM Frequency Division Multiplexing
- FET Field-Effect Transistor
- fg foreground
- FHSS Frequency-Hopping Spread Spectrum
- FID Format IDentifier
- FIPS Federal Information Processing Standard
- FIX Federal Information EXchange
- FM Function Management
- FMD Function Management Data
- FNC Federal Networking Council
- FOIM Field Office Information Management System
- FORTRAN FORmula TRANslation
- FOSI Format Output Specification Instance
- FPO For Position Only
- fps frames per second
- FPU Floating -Point Unit
- FQDN Fully Qualified Domain Name
- FRC Functional Redundancy Check
- FSF Free Software Foundation
- FSK Frequency Shift Keying
- FSN Full Service Network
- FSR Free System Resources
- FSU File Support Utility
- FT-1 Fractional T-1
- FTA Floptical Technology Association
- FTAM File Transfer Access and Management
- ftp file transfer protocol / file transfer program
- FTS Federal Telecommunications System
- FWIW For What It's Worth
- FYA For Your Amusement
- FYI For Your Information