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