| Zârna | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Argeș County |
| Length: | 17km (11miles) |
| Source1: | Făgăraș Mountains |
| Mouth: | Râul Doamnei |
| Mouth Coordinates: | 45.4829°N 24.8681°W |
| Basin Size: | 77km2 |
| Tributaries Left: | Ludișor, Valea Stâncoasă, Brătila, Piscul cu Păișu, Izvorul Porcului |
| Tributaries Right: | Jgheburoasa, Leaota, Căpățâna |
The Zârna is a left tributary of the Râul Doamnei in Romania. Its source is the Zârna Lake in the Făgăraș Mountains. Its length is 17km (11miles) and its basin size is 77km2.