| Conflict: | Battle of Lonoy |
| Partof: | Philippine–American War |
| Date: | 5 March 1901 |
| Place: | Lonoy, Jagna, Bohol, Philippines |
| Result: | American victory |
| Combatant2: |  United States |
| Commander1: | Captain Gregorio Casenas†[1] |
| Commander2: | Not Defined |
| Strength1: | 413 Bohol natives |
| Strength2: | Unknown |
| Casualties1: | over 406 killed |
| Casualties2: | 3 killed, 10 wounded |
The Battle of Lonoy, also known as the Lonoy Massacre, was a surprise attack in 1901 during the Philippine–American War when over 400 Filipino revolutionaries were killed by United States Armed Forces. It was fought in Lonoy, Jagna, Bohol on Bohol island.
Filipino forces laid an ambush along a narrow path. They were poorly armed, with daggers, machetes, and spears and few firearms. The American force learned of the ambush from a pro-American local, Captain Francisco Acala, the last Spanish Mayor of Jagna. He led the Americans to the rear of the Filipinos. In a surprise attack, the Filipinos found themselves trapped in their own trenches. All but seven were killed, a total 406, including the commander, Captain Gregorio "Guyo" Casenas. Americans casualties were three killed and ten wounded, which came toward the end when the Filipinos launched a counter-attack.
In April 24, 2011, Captain Casenas and his men were honored by the municipality of Jagna with a statue at the municipal's plaza.[2]