| 21st Division | |
|---|---|
&sq=&lang=&file=File:21st_Philippine_Division_Emblem_1941-42-XXI.jpg) 21st Philippine Division Emblem 1941-42 | |
| Active | 1941 - 9 April 1942 |
| Country |  Commonwealth of the Philippines |
| Allegiance |  United States Army&sq=&lang=&file=File:Philippine_Commonwealth_Army_Flag.png){kind=small} Philippine Commonwealth Army |
| Branch | Army |
| Type | Infantry Division |
| Role | Army Reserve |
| Size | 8,500 |
| Part of | North Luzon Force; I Philippine Corps |
| Garrison/HQ | Camp Malatiqui, Santa Ignacia, Tarlac |
| Engagements | World War II |
| Commanders | |
| Commander | BGen Mateo M. Capinpin |
| Senior Instructor | Col. Ray O'Day, USA |
| Chief of Staff | LCol. Filomeno Villaluz Col. Nemesio Catalan |
| Notable commanders | Brigadier General Mateo M. Capinpin |
| WWII Philippine Army Divisions | ||||
|
The 21st Infantry Division was one of the 10 reserve division of the Philippine Army mobilized under the United States Army Forces in the Far East (USAFFE). The unit was involved in the delaying action against the Japanese invasion in the plains of Central Luzon, and the Battle of Bataan in 1942.