DCG may refer to:
- Definite clause grammar, a means of expressing grammatical relationships
- Discounted Cumulative Gain, a performance measure for search engine ranking algorithms
- Discontinuous gas exchange, a physiological pattern of respiratory gas exchange used by insects
- Disney Channel Games 2008, Disney competition
- Dreigiau Casnewydd Gwent (Newport Gwent Dragons), a Welsh rugby union club
- Dual-clutch gearbox