Trianon may refer to:
- Le Grand Trianon, a palace near Versailles, France
- Le Petit Trianon, a château near Versailles, France
- Le Trianon (theatre), a theatre and concert hall at 80, boulevard de Rochechouart in Paris
- Treaty of Trianon, 1920 post-World War I treaty between Allies and Hungary, defining its borders
- Trianon (Frankfurt am Main), a skyscraper in Germany
- Hotel Trianon, fictional hotel in Graham Greene's 1966 novel The Comedians
- The Trianon, formerly "Claremont", 1907 mansion now the main building of The Colorado Springs School
- "Trianon", the codename of the CIA spy in the 1984 Soviet film TASS Is Authorized to Declare...
- Trianon Ballrooms, ballrooms during America's big band era
- Trianon, a trade name of sulfapyridine
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