Situationism may refer to:
- The ideas of Situationist International, an international political and artistic movement of the 1950s and 1960s. Adherents vociferously rejected the term 'Situationism'.
- Situationism (psychology), which holds that personality is more influenced by external factors than by internal traits or motivations
- In Situational ethics, the idea in ethics that the morality of an act is a function of the state of the system when it occurs