| Arieșul Mare | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Alba County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Arieșeni, Scărișoara, Albac |
| Source1: | Mount Vârtopul |
| Source1 Coordinates: | 46.5064°N 22.6814°W |
| Source1 Elevation: | 1260m (4,130feet) |
| Mouth: | Arieș |
| Mouth Location: | Lake Mihoești near Câmpeni |
| Mouth Coordinates: | 46.3722°N 23.0169°W |
| Mouth Elevation: | 570m (1,870feet) |
| Tributaries Left: | Gârda Seacă, Albac |
| Tributaries Right: | Neagra |
The Arieșul Mare (Hungarian: Nagy-Aranyos) is a river in the Apuseni Mountains, Alba County, western Romania. It is the left headwater of the river Arieș. It flows through the villages Arieșeni, Gârda de Sus, Scărișoara, Albac and Vadu Moților, and joins the Arieșul Mic (the other headwater) in Mihoești near Câmpeni.[1] Its length is about 43km (27miles) and its basin size is about 400km2.
The following rivers are tributaries to the river Arieșul Mare (from source to mouth):