John Christopher Mahoney

John Christopher Mahoney (December 19, 1882 – November 18, 1952) was a federal judge in the United States.

Mahoney was born in Ireland but spent most of his life in Rhode Island. He attended Brown University and Harvard Law School. He worked for many years as a lawyer in private practice in Providence, Rhode Island and also served as an Assistant United States Attorney from 1917 to 1921, and as City Solicitor of Providence from 1931 to 1935.

In 1935, President Franklin D. Roosevelt nominated Mahoney to the United States District Court for the District of Rhode Island. In 1940, President Roosevelt promoted Mahoney to the United States Court of Appeals for the First Circuit, on which he served as an active judge for 10 years before taking senior status in 1950.