Sidney H. Stein (born 1945) is a United States federal judge. He assumed senior status on September 1, 2010.
Born in Passaic, New Jersey, Stein was a New York Army National Guard from 1969 to 1975. He received an A.B. from Princeton University in 1967 and attended the New York University Graduate School of Education before receiving a J.D. from Yale Law School in 1972. He was a law clerk to the Hon. Stanley Fuld, Chief judge of the New York Court of Appeals from 1972 to 1973. He was in private practice in New York City from 1974 to 1995.
On January 11, 1995, Stein was nominated by President Bill Clinton to a seat on the United States District Court for the Southern District of New York vacated by Pierre N. Leval. Stein was confirmed by the United States Senate on March 17, 1995, and received his commission the same day.