| Unit Name: | 31st Division |
| Dates: | 18 November 1941 - 9 April 1942 |
| Branch: | Philippine Army |
| Type: | Infantry Division |
| Size: | 6,000 |
| Command Structure: | North Luzon Force (I Philippine Corps) |
| Current Commander: | BGen Clifford Bluemel |
| Garrison: | Camp Dau (Del Pilar), Mabalacat, Pampanga |
| Commander1 Label: | Commander |
| Ceremonial Chief: | Col. Edwin Aldridge, USA |
| Commander2 Label: | Senior Instructor |
| Colonel Of The Regiment: | LCol. Pastor Martelino, PA |
| Commander3 Label: | Chief of Staff |
| Battles: | World War II |
The 31st Infantry Division was a division of the Philippine Army under the United States Army Forces in the Far East (USAFFE).
It was active from November 18, 1941 to April 9, 1942, whereupon it surrendered when Bataan fell. It was organized and trained in Zambales Province of Northern Luzon. Col. (later BGen.) Clifford Bluemel (USA) was the division's commander. Col. Pastor C. Martelino (PA), a 1920 U.S. Military Academy graduate, was his chief of staff.[1] [2]
At the opening of hostilities, 8 December 1941, the 31st Division formed a part of BGen. (later LGen.) Jonathan M. Wainwright's North Luzon Force of the Philippine Army (later renamed I Philippine Corps), alongside the 11th and 21st Divisions, and the 26th Cavalry Regiment. The 31st was initially headquartered at San Mateo, Rizal, but most of its personnel were training at San Marcelino, Zambales, near Subic Bay, when hostilities broke out.