Convention may mean:
- Convention (norm), a custom or tradition, a standard of presentation or conduct
- Treaty, an agreement in international law
- Convention (meeting), meeting of a (usually large) group of people and/or companies who share a common interest
- Fan convention, a gathering of fans of a particular genre
- Gaming convention, has role-playing games, collectible card games, miniatures wargames, board games, video games, and the like
- Political convention, a formal gathering of people for political purposes
- Trade fair
- Bridge convention, a term in the game of bridge
- Convention (Paris Métro), a station on line 12 of the Paris Métro in the 15th arrondissement
- "The Convention" (The Office episode)
- "Convention" (Malcolm in the Middle episode)