| Râncăciov | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Argeș County |
| Length: | 25km (16miles) |
| Mouth: | Argeș |
| Mouth Location: | Catanele |
| Mouth Coordinates: | 44.8015°N 25.0227°W |
| Basin Size: | 65km2 |
| Tributaries Right: | Lăpuș |
The Râncăciov is a left tributary of the river Argeș in Romania. It discharges into the Argeș near Catanele. It flows through the towns and villages Valea Corbului, Cârstieni, Urlucea and Râncăciov. Its length is 25km (16miles) and its basin size is 65km2.