Fast or FAST may refer to:
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People with the given name
- Fast Robinson (born 1994), English actor known professionally as Eddie-Joe Robinson
People with the surname
- Alexia Fast (born 1992), Canadian actress
- Christian Fast (1762–1841), American soldier and pioneer
- Herman Becker Fast (1887–1945), American businessman, farmer, and politician
- Howard Fast (1914–2003), American novelist and television writer
- Jesper Fast (born 1991), Swedish ice hockey player
- Jonathan Fast (born 1948), American author, son of Howard Fast
- Julius Fast (1919–2008), American author, brother of Howard Fast
- Matt Fast, lead singer of the Canadian punk band The Undecided
- Molly Jong-Fast (born 1978), American author, daughter of Jonathan Fast
- Piotr Fast (born 1951), Polish professor and translator
- FAST (stroke) (Face, Arm, Speech, and Time), a mnemonic for the symptoms of a stroke
- Family System Test, a visualization method for representing cohesion and hierarchy constellations in families and similar social systems
- Farpoint Asteroid Search Team, an asteroid search team located at the Farpoint Observatory
- Fast Auroral Snapshot Explorer, one in the series of NASA's Small Explorer spacecraft
- Five-hundred-meter Aperture Spherical Telescope (五百米口径球面射电望远镜), a large single-dish radio telescope in Guizhou province, China
- Fluorescence-activating and absorption-shifting tag, genetically encoded protein tag used in molecular biology
- Focused assessment with sonography for trauma, an ultrasound used to examine the abdomen of a trauma patient
- Fourier amplitude sensitivity testing, a variance-based global sensitivity analysis method
- Future Attribute Screening Technology