| Tom Dunn | |
| Birth Name: | Thomas Patrick Dunn |
| Birth Date: | 15 March 1900 |
| Birth Place: | Athol, Massachusetts |
| Death Place: | Prince George's County, Maryland |
| Employer: | National League |
| Occupation: | Umpire |
| Years Active: | 1939–1946 |
Thomas Patrick Dunn (March 15, 1900 – January 20, 1976) was a professional baseball umpire who worked in the National League from 1939 to 1946. Dunn umpired 1146 regular season Major League Baseball (MLB) games in his 8-year career. He also umpired in the 1944 World Series and the 1943 All-Star Game.[1]
The first major league game that Dunn umpired – between Boston and Brooklyn on June 27, 1939 – lasted 23 innings, one of the longest games in MLB history.[2] It was declared a 2–2 tie, after 5 hours and 15 minutes.[3]