| F | Fluorine |
| FA | Failure Analysis |
| FAA | Federal Aviation Administration |
| FAB | Fast Atom Bombardment |
| FALC | Frame And Line interface Component |
| FAMOS | Floating-gate Avalanche-injection Metal-Oxide Semiconductor |
| FAQ | Frequently Asked Questions |
| FAR | Failure Analysis Report |
| FB | Free to Bound (process) |
| FC | Field Cooling; Flip Chip |
| FCC | Face Centered Cubic; Federal Communications Commission; Flat Conductor Cable |
| FCM | Facilities Cost Model |
| FCODE | Forth Code (PCI device driver programming language) |
| FCS | Factory Control System |
| FDA | Food and Drug Administration |
| FDC | Fault Detection and Classification; Floppy Disc Controller |
| FDD | Floppy Disk Drive; Frequency Division Duplex |
| FDE | Frequency Domain Experiments |
| FDM | Frequency Division Multiplexing |
| FDMS | Flash Desorption Mass Spectrometry |
| Fe | Iron |
| FE | Free Exiton; Fermi Energy |
| FEA | Finite Element Analysis |
| FEC | Fabrication Evaluation Chip; Forward Error Correction |
| FED | Field Emissive Display |
| FEG | Field Emission Gun |
| FEL | Free Electron Laser |
| FEM | Finite Element Method |
| femto | 1.00E-15 (1/1,000,000,000,000,000; symbolized by the prefix f) |
| FEOL | Front-End Of Line |
| FEP | Fluorinated Ethylene-Propylene (Teflon) |
| FESEM | Field Emission Scanning Electron Microscope |
| FET | Field Effect Transistor |
| FFT | Fast Fourier Transform |
| FG | Finished Goods |
| FI | Filterability Index; Factory Integration |
| F/I | Final Inspect |
| FIB | Focused Ion Beam |
| FIC | Fluid Integrated Circuit |
| FID | Flame Ionization Detector |
| FIFO | First-In, First-Out |
| FIM | Field Ion Microscopy |
| FIR | Far InfraRed |
| FIT | Failure unit |
| FL | Fuzzy Logic |
| FLAPW | Full potential Linearized APW |
| FLIR | Forward Looking Infrared |
| FLOODS | FLorida Object-Oriented Device Simulator |
| FLOOPS | FLorida Object-Oriented Process Simulator |
| FLOPC | FLoating point Operations needed Per Cycle |
| FLOTOX | FLOating gate Tunnel OXide |
| FLP | Fermi Level Pinning |
| FLRT | Factory Layout/Relayout Tool |
| Fm | Fermium |
| FM | Foreign material; Ferro Magnetic; Frequency Modulation |
| FMEA | Failure Mode and Effects Analysis |
| FMMC | Factory Material Movement Component |
| FMS | Forms Management System |
| FMS | Forms Management System |
| FMVP | Framework Member Validation project |
| FNN | Feed-forward Neural Network |
| FOCS | Fiber Optic Chemical Sensors |
| FOLZ | First-Order Laue Zone |
| FOMP | First Order Magnetization Process |
| FOUP | Front Opening Unified Pod |
| FOV | Field Of View |
| FOX | Field OXide |
| FP | Flash Point |
| FPA | Focal Plane Array |
| FPAA | Field Programmable Analog Array |
| FPD | Focal-Plane Deviation; Flat Panel Display |
| FPD-RAM | Fast Page DRAM |
| FPGA | Field-Programmable Gate Array |
| FPLA | Field-Programmable Logic Array |
| FPLF | Field-Programmable Logic Family |
| FPLS | Field-Programmable Logic Switch |
| FPM | Flexual Plate Mode |
| FPMS | Factory Performance Modeling Software |
| FPROM | Field-Programmable Read-Only Memory |
| FPT | Fine Pitch Technology |
| FPX | Kodak Flashpix image format |
| FQA | Fixed Quality Area |
| FQHE | Fractional Quantum Hall Effect |
| Fr | Francium |
| FRAC | Frame Aligner Circuit |
| FRACAS | Failure Reporting, Analysis, and Corrective Action System |
| FRAM | Ferroelectric RAM (q.v.) |
| FRAME | Failure Rate Analysis and Modeling |
| FRMB | Fast Ramp Mini Batch |
| FSCM | Federal Stock Code for Manufacturers |
| FSE | Field Scanned (Stepped) ENDOR |
| FSG | Fluorinated Silicate Glass |
| FSK | Frequency Shift Keying |
| FSM | Finite State Machine |
| FS-PAL | Field Sequential Phase Alternation Line |
| FSS | Full Scale Span |
| FT | Final Test; Fourier Transform |
| FTA | Fault tree analysis; Free-To-Air |
| FTAB | Focus Technical Advisory Board |
| FTIR | Fourier Transform InfraRed |
| FTL | Flash Transition Layer |
| FTP | File Transfer Protocol |
| FTPL | Fourier Transform Photo Luminescence |
| FTTC | Fiber-To-The-Curb |
| FTTD | Fiber-To-The-Desk |
| FTTH | Fiber-To-The-Home |
| FW | Full Wave |
| FWHM | Full Width at Half Maximum |
| FWHP | Full Width at Half Peak (=FWHM) |
| FYI | For Your Information |
| FZ | Float Zone |