Decca may refer to:
- Decedents of the original Decca Gramophone Company
- Decca Label Group, a classical music record label, owned by Universal Music Group
- Decca Records or Decca Music Group, a record label
- Decca Studios, a recording facility in West Hampstead, England
- Decca tree, a microphone recording system
- Decca Broadway, a musical theater record label
- London Decca, a maker of turntable tonearms and cartridges
- Decca Radar later Racal-Decca Marine, a defunct marine electronics manufacturer
- Decca Navigator System, a defunct marine and aeronautical navigation system
- Decca or Jessica Mitford (1917-1996), British-American investigative journalist
- Decca: The Letters of Jessica Mitford, a 2006 book
- Decca Sports Ground, a cricket ground in London, England
- Decca, old spelling of Dhaka, capital of Bangladesh
- The Deccas, a guitar based band from Medway, England
- Mpundi Decca, Congolese guitarist