Stassen is a surname that occurs mainly in Belgium, Germany, and Holland, but whose owners' descendants have migrated all over the world. It may refer to:
- Ben Stassen (contemporary), Belgian film director and producer
- Franz Stassen (1869–1949), German painter and illustrator
- Glen Stassen (contemporary), American ethicist, professor, and Baptist theologian
- Harold Stassen (1907–2001), American politician from Minnesota; governor of Minnesota 1939–43; perennial candidate for U.S. president
- Jean-Philippe Stassen (b. 1966), Belgian comic book artist
- Jean Marie Stassen (b. 1953), Belgian scientist
- Laurence Stassen (b. 1971), Netherlands politician
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