Action has several meanings:
- Action movie
- Action game
- Action Comics, a comic book series
- In physics, the action is a crucial concept in Lagrangian mechanics
- In philosophy, action is effective will
- Civil action or lawsuit
- Collective action
- Direct action is the political term for acting on things that directly affect you.
- Slang for sexual activity
- Military action
- Firearm action
- A 1960s band called the Action.
- In group theory, a group action.