| Mount Besar | |
| Other Name: | Gunung Besar |
| Elevation M: | 1,899 |
| Elevation Ref: | [1] |
| Location: | Sumatra, Indonesia |
| Range: | Bukit Barisan |
| Map: | Indonesia Sumatra |
| Map Size: | 275 |
| Label Position: | left |
| Coordinates: | -4.43°N 103.67°W |
| Type: | stratovolcano |
| Last Eruption: | April 1940 |
Mount Besar (means: Big Mountain) is a stratovolcano in the southeast of Sumatra, Indonesia. A minor sulfur deposit can be found in the crater. A big solfatara field called Marga Bayur is located along its north–south-west flanks or the Semangko fault system.[1]