| Conflict: | Battle of Kupres |
| Partof: | World War II in Yugoslavia |
| Date: | 28 July – 19 August 1942 |
| Place: | Kupres, Independent State of Croatia (modern-day Bosnia and Herzegovina) |
| Result: | Independent State of Croatia victory
|
| Combatant1: | Axis |
| Combatant2: | Allies |
| Commander1: | Franjo Šimić Rafael Boban |
| Commander2: | Sreten Žujović |
| Units1: | Ustaše Militia
Croatian Home Guard |
| Units2: | 2nd Proletarian brigade 3rd Proletarian 4th Proletarian brigade 10th Herzegovinian Brigade 1st Krajina Brigade 3rd Krajina NOP Detachment |
| Strength1: | 1,400–1,500 |
| Strength2: | 2,100–3,000 |
The Battle of Kupres was fought in 1942 during World War 2 in Independent State of Croatia between the forces of the Independent State of Croatia and the Yugoslav Partisans, in and around the town of Kupres in western Bosnia. The Partisans launched three concentrated attacks against the garrison of 1,500 men during the nights of 11/12 August, 14 August and 19 August. Although outnumbered, the Black Legion, Croatian Home Guard and local militia units successfully defended the town against several Partisan brigades.
See main article: Partisan Long March. In July 1942, the 2nd Proletarian Brigade moved on Kupres and, with the assistance of local Partisans, seized control over several villages in the vicinity. During the night of 4 August 1942 the Partisans attacked the town of Livno and captured it in the following days. The plan of the National Liberation Army Supreme Command, following the seizure of Livno, was to move the Proletarian Assault Brigades to Kupres, whose capture was vital for further actions in the valley of River Vrbas.
Yugoslav Partisans 11/12 August 1942, 13 battalions with around 2,100 men[1]
14 August 1942, 16 battalions with around 2,400 - 3,000[2] men
11/12 August 1942, in total around 1,400 men[1]
14 August 1942, around 1,500 armed men[3]