Ernest O'Brien

Ernest Aloysius O'Brien (July 1, 1880 – October 9, 1948) was a United States federal judge.

Born in Detroit, Michigan, O'Brien received a B.A. from Detroit College in 1898 and an LL.B. from Detroit College of Law in 1905. He was in private practice in Detroit from 1906 to 1928. He was a judge on the Circuit Court of Michigan in 1928, returning to private practice from 1928 to 1931.

On February 26, 1931, O'Brien was nominated by President Herbert Hoover to a new seat on the United States District Court for the Eastern District of Michigan created by 46 Stat. 1197. He was confirmed by the United States Senate on March 2, 1931, and received his commission on March 4, 1931. O'Brien served in that capacity until his death, in 1948.