| Official Name: | Sumatra, Montana |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Montana#USA |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Montana |
| Subdivision Type2: | County |
| Subdivision Name2: | Rosebud |
| Timezone: | Mountain (MST) |
| Utc Offset: | -7 |
| Timezone Dst: | MDT |
| Utc Offset Dst: | -6 |
| Elevation Ft: | 3202 |
| Coordinates: | 46.6183°N -107.5511°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 59083[1] |
| Area Code: | 406 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 777301 |
Sumatra is an unincorporated community in far northwestern Rosebud County, Montana, United States. It consists of a church and a post office, with respective houses, surrounded by open ranch land.
Sumatra was established in 1905 as a station stop, called Summit, on the Milwaukee Road. The town name was changed to Sumatra, after an Indonesian island, with the opening of the post office in 1910.[2]