John Joseph O'Connell (8 September 1894 – 16 December 1949) was a United States federal judge. Born in Pittsburgh, Pennsylvania, he received a B.S. from Duquesne University in 1928, and an LL.B. from Duquesne University School of Law in 1931. He was in the United States Navy from 1918 to 1919.
From 1931 to 1936 he engaged in private practice in Pittsburgh, Pennsylvania, becoming an Assistant solicitor in the Allegheny County, Pennsylvania, from 1936 to 1943 and a Solicitor in the same county from 1944 to 1945.
He was a federal judge on the United States Court of Appeals for the Third Circuit, later being nominated by President Harry S Truman on September 12, 1945, to a new seat created by 58 Stat. 796. He was confirmed by the United States Senate on October 3, 1945, and received his commission on October 11 of the same year. His service terminated on December 16, 1949, due to death.