| 21st Marine Regiment | |
|---|---|
| Active | 1942 —45 |
| Country | United States |
| Branch | United States Marine Corps |
| Type | Infantry regiment |
| Engagements | World War II * Battle of Bougainville * Battle of Guam * Battle of Iwo Jima |
| Commanders | |
| Notable commanders | Robert Blake Arthur H. Butler |
The 21st Marine Regiment (21st Marines) was an infantry regiment of the United States Marine Corps. Commissioned for service during World War II, the regiment fought in the battles of Bougainville, Guam and Iwo Jima. It fell under the command of the 3rd Marine Division and was decommissioned at the end of the war on December 20, 1945.[1]