A fret is a raised portion on the neck of a stringed instrument.

Fret or FRET may also refer to:

Förster resonance energy transfer or fluorescence resonance energy transfer; a fluorescence phenomenon with applications in biology and chemistry FRET or Formal Requirements Elicitation Tool Fret (architecture), a repeated geometric ornament, forming a frieze Fret (heraldry), a heraldic charge FRET (magazine), a free magazine about the pop music scene in the Netherlands SNCF Fret, the rail freight organisation of the SNCF worry, as in to fret about something Sea fret or haar, a cold sea fog

See also Fretter, an American electronics retailer Fretting, wear and corrosion damage at the asperities of contact surfaces