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4F or 4-F may refer to:
- 4F, or four flats, key signature of A-flat major in music
- 4F (company), a Polish sportswear company
- 4-F classification in the U.S. Selective Service System, identifying a person as unfit for military service
- 4F correlator, in Fourier optics
- Flottille 4F a French naval aviation squadron
- LMS Fowler Class 4F, a class of 0-6-0 steam locomotive
- 4F, the production code for the 1975 Doctor Who serial Terror of the Zygons
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