Samuel Mandelbaum (September 20, 1884 – November 20, 1946) was a United States district judge of the United States District Court for the Southern District of New York.

Born on September 20, 1884, in the Russian Empire, Mandelbaum received a Bachelor of Laws in 1912 from New York University School of Law and a Master of Laws in 1913 from the same institution. He entered private practice in New York City, New York from 1912 to 1923. He was a member of the New York State Assembly from 1923 to 1932 and a member of the New York State Senate from 1932 to 1936.^[1]

Mandelbaum was nominated by President Franklin D. Roosevelt on June 15, 1936, to the United States District Court for the Southern District of New York, to a new seat authorized by 49 Stat. 1491. He was confirmed by the United States Senate on June 20, 1936, and received his commission on June 22, 1936. His service terminated on November 20, 1946, due to his death in University Place, New York.^[1]

• List of Jewish American jurists