COIN or COINS may refer to:

• Coin (band) (often stylized COIN), an American indie pop band
• COIN (board game), a series of asymmetric board games
• Coinbase (Nasdaq: COIN), a company which operates a cryptocurrency exchange
• Collaborative innovation network, innovative teams
• Community of interest network
• Combined Online Information System, a UK database containing HM Treasury's analysis of departmental spending
• ContextObjects in Spans (COinS), a specification for publishing OpenURL references in HTML
• Counter-insurgency
  • Counter-insurgency aircraft

• COIN-OR, the Computational Infrastructure for Operations Research project
• Coin (disambiguation)