COIN or COINS may refer to:

Civic Openness In Negotiations, collective bargaining practice

Coin (band) (often stylized COIN), an American indie pop band

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