Ornstein may refer to:
Donald Samuel Ornstein (b. 1934), American mathematician
Jonathan G. Ornstein, CEO of Mesa Air Group, Inc.
Leo Ornstein (1895–2002), Russian-American composer
Leonard Salomon Ornstein (1880–1941), Dutch physicist known for the Ornstein–Zernike equation and the Ornstein–Uhlenbeck process
Michael Marisi Ornstein (b. 1963), American actor
Norman J. Ornstein, American political scientist
Robert Ornstein (b. 1942), American psychologist
Severo Ornstein, American computer scientist and son of Leo Ornstein
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