| Șumuleul Mare | |
| Name Other: | Nagy-Somlyó |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Harghita County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Ciumani |
| Source1: | Gurghiu Mountains, Mount Opro |
| Source1 Coordinates: | 46.5883°N 25.4292°W |
| Source1 Elevation: | 1349m (4,426feet) |
| Mouth: | Mureș |
| Mouth Location: | Ciumani |
| Mouth Coordinates: | 46.6875°N 25.4903°W |
| Mouth Elevation: | 733m (2,405feet) |
| Tributaries Right: | Șumuleul Mic |
The Șumuleul Mare (also: Șomleul Mare; Hungarian: Nagy-Somlyó, in Hungarian pronounced as /ˈnɒcʃomjoː/) is a small river in the Gurghiu Mountains, Harghita County, central Romania. It is a left tributary of the river Mureș. It flows through the municipality Ciumani, and joins the Mureș near the village Ciumani. Its length is 17km (11miles) and its basin size is 54km2.