| Boia Mare | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Vâlcea County |
| Length: | 23km (14miles) |
| Source1: | Făgăraș Mountains |
| Mouth: | Olt |
| Mouth Location: | Greblești |
| Mouth Coordinates: | 45.4732°N 24.2966°W |
| Basin Size: | 158km2 |
| Tributaries Left: | Valea Pietricelelor, Dăescu, Găujani |
| Tributaries Right: | Izvorul Olanului, Boia Mică |
The Boia Mare is a left tributary of the river Olt in Romania. The Boia Mare's source is in the Făgăraș Mountains. It discharges into the Olt in Greblești.[1] Its length is 23km (14miles) and its basin size is 158km2.[2]