| Conflict: | Operation Wahiawa |
| Partof: | Vietnam War |
| Date: | 16–30 May 1966 |
| Place: | Hậu Nghĩa Province (now in Binh Duong Province), South Vietnam |
| Result: | U.S. claims operational success |
| Combatant1: |  United States |
| Combatant2: | Viet Cong |
| Commander1: | MGen Frederick C. Weyand |
| Commander2: | |
| Units1: | 25th Infantry Division |
| Units2: | 1st Battalion, 165A Regiment |
| Casualties2: | US body count: 157 killed |
Operation Wahiawa was an operation conducted by the 25th Infantry Division in Hậu Nghĩa Province, lasting from 16 to 30 May 1966.[1]
U.S. intelligence indicated that the Viet Cong (VC) 1st Battalion, 165A Regiment and its headquarters and supply depots were located in the Filhol Plantation, the Ho Bo Woods and the Boi Loi Woods (now in Binh Duong Province).[1]
Due to the proximity of the operational area to the 25th Division's Củ Chi Base Camp, Division commander BG Frederick C. Weyand committed the entire division to the operation. The division's sweeps encountered sporadic resistance and uncovered numerous supply caches.[1]
Operation Wahiawa officially concluded on 30 May, the US had claimed VC losses were 157 killed.[1]