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Leo Zippin (1905 – May 11, 1995) was an American mathematician. His parents were Bella Salwen and Max Zippin who immigrated to New York City from the Ukraine in 1903.
He did his undergraduate and graduate work at University of Pennsylvania in 1929. His doctoral adviser was John Robert Kline. He was the author of The Uses Of Infinity and together with Deane Montgomery, the monograph Topological Transformation Groups. In 1952, he, along with Andrew M. Gleason and Deane Montgomery solved Hilbert's fifth problem.
- Earman, John; Glymour, Clark N.; Stachel, John J.; Minnesota Center for Philosophy of Science (1977). Foundations of space-time theories. U of Minnesota Press. pp. 38–. ISBN 978-0-8166-0807-2. Retrieved 22 May 2011.
- Montgomery, Deane; Zippin, Leo (May 1952). "Small subgroups of finite-dimensional groups". Proc Natl Acad Sci U S A 38 (5): 440–442. PMC 1063582.