| Mădărașul Mare | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Harghita County |
| Length: | 17km (11miles) |
| Mouth: | Olt |
| Mouth Coordinates: | 46.4967°N 25.7507°W |
| Basin Size: | 62km2 |
| Tributaries Right: | Șingai |
The Mădărașul Mare is a right tributary of the river Olt in Romania. It discharges into the Olt in the village Mădăraș. Its length is 17km (11miles) and its basin size is 62km2.