Thomas Aquinas Flannery (May 10, 1918 – September 20, 2007) was a United States federal judge.
Born in Washington, D.C., Flannery received an LL.B. from Catholic University of America School of Law in 1940. He was in private practice in Washington, DC from 1940 to 1942. He was in the United States Army Air Corps from 1942 to 1945. He was in private practice in Washington, DC from 1945 to 1948. He was a Trial attorney of U.S. Department of Justice, Washington, DC from 1948 to 1950. He was an Assistant U.S. attorney for the District of Columbia from 1950 to 1962. He was in private practice in Washington, DC from 1962 to 1969. He was the United States Attorney for the District of Columbia from 1969 to 1971.
Judge of the United States District Court for the District of Columbia, Flannery was nominated by President Richard Nixon on November 18, 1971, to a seat vacated by Leonard P. Walsh. He was confirmed by the United States Senate on December 1, 1971, and received his commission on December 6, 1971. He assumed senior status on May 10, 1985. Flannery served in that capacity until September 20, 2007, due to his death.
He died in Washington, D.C.