| Gregory Francis Noonan | |
| Office: | Judge of the United States District Court for the Southern District of New York |
| Term Start: | October 21, 1949 |
| Term End: | May 1, 1964 |
| Appointer: | Harry S. Truman |
| Predecessor: | Seat established by 63 Stat. 493 |
| Successor: | Marvin E. Frankel |
| Office1: | United States Attorney for the Southern District of New York Acting |
| President1: | Franklin D. Roosevelt |
| Term Start1: | December 1938 |
| Term End1: | March 1939 |
| Predecessor1: | Lamar Hardy |
| Successor1: | John T. Cahill |
| Birth Name: | Gregory Francis Noonan |
| Birth Date: | 12 May 1906 |
| Birth Place: | New York City, New York |
| Death Place: | New Rochelle, New York |
| Education: | Fordham University School of Law (LL.B.) |
Gregory Francis Noonan (May 12, 1906 – May 1, 1964) was a United States district judge of the United States District Court for the Southern District of New York.
Born in New York City, New York, Noonan received a Bachelor of Laws from Fordham University School of Law in 1928. He was in private practice in New York City from 1928 to 1934. He was an Assistant United States Attorney of the Southern District of New York, Civil Division from 1934 to 1936. He was Chief of the Criminal Division of the United States Attorney's Office for the Southern District of New York from 1936 to 1938. He was Chief Assistant United States Attorney of the Southern District of New York in 1938. He was the acting United States Attorney for the Southern District of New York from December 1938 to March 1939. He was in private practice in New York City from 1939 to 1949.
Noonan received a recess appointment from President Harry S. Truman on October 21, 1949, to the United States District Court for the Southern District of New York, to a new seat created by 63 Stat. 493. He was nominated to the same seat by President Truman on January 5, 1950. He was confirmed by the United States Senate on April 25, 1950, and received his commission on April 26, 1950. Noonan served in that capacity until his death of a heart ailment on May 1, 1964, at Montefiore New Rochelle Hospital in New Rochelle, New York.[1]