- Fathoms (US, Survey) (Length)
- Feet (International) (Length)
- Feet (US, Survey) (Length)
- Feet/second
^{2}(Acceleration) - Fermi (Length)
- Firkins (Brit, flu) (Volume)
- Foot of water (4 °C) (Pressure)
- Foot-grains (Energy)
- Foot-pound force per hour (Power)
- Foot-pound force per minute (Power)
- Foot-pound force per second (Power)
- Foot-poundal per second (Power)
- Foot-poundals (Energy)
- Foot-pounds (force) (Energy)
- Foot/hour (Linear Velocity)
- Foot/minute (Linear Velocity)
- Foot/second (Linear Velocity)
- Fortnight (Time)
- Furlong/fortnight (Linear Velocity)
- Furlongs (US, Survey) (Length)

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