| Conflict: | Battle of Karstula |
| Partof: | the Finnish War |
| Date: | 21 August 1808 |
| Place: | Karstula, Swedish Finland |
| Result: | Russian victory |
| Combatant1: | Sweden |
| Combatant2: | Russian Empire |
| Commander1: | Otto von Fieandt |
| Commander2: | Yegor Vlastov |
| Strength1: | 1,500–1,600 6 guns |
| Strength2: | 3,200 7 guns |
| Casualties1: | 313: 60 killed 116 wounded 137 missing |
| Casualties2: | 245 killed, wounded or captured |
The Battle of Karstula was fought between Swedish and Russian troops on August 21, 1808. The Swedish force under Otto von Fieandt was defeated by a much bigger Russian force under Yegor Vlastov. During the battle and retreat the Swedes lost 313 men, the Russians lost 245.
150px|thumb|Positions of the forces