Terry de la Mesa Allen Sr. | |
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| Nickname(s) | "Terrible Terry" |
| Born | April 1, 1888 Fort Douglas, Utah, U.S. |
| Died | September 12, 1969 (aged 81) El Paso, Texas, U.S. |
| Allegiance |  United States |
| Service |  United States Army |
| Years of service | 1912–1946 |
| Rank |  Major General |
| Service number | 0-3461 |
| Unit |  Cavalry Branch |
| Commands | 3rd Battalion, 358th Infantry Regiment 3rd Cavalry Brigade 2nd Cavalry Division 1st Infantry Division 104th Infantry Division |
| Battles / wars | World War I World War II |
| Awards | Army Distinguished Service Medal (2) Croix de Guerre Silver Star Legion of Merit Purple Heart (2) |
Major General Terry de la Mesa Allen Sr. (April 1, 1888 – September 12, 1969) was a senior United States Army officer who fought in both World War I and World War II. Allen was a decorated World War I veteran, where he commanded an infantry battalion at the relatively young age of 30 in 1918 and was wounded twice, and, after America's entry into World War II in late 1941, he commanded the 1st Infantry Division in North Africa and Sicily from May 1942 until August 1943. He was later selected to lead the 104th Infantry Division as divisional commander, a post he held until the war's end in 1945.