| Șucu | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Caraș-Severin County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Poiana Mărului |
| Length: | 16km (10miles) |
| Source1: | Țarcu Mountains |
| Mouth: | Bistra Mărului |
| Mouth Location: | Poiana Mărului |
| Mouth Coordinates: | 45.4022°N 22.5416°W |
| Progression: | Bistra Mărului→ |
| Basin Size: | 79km2 |
| Tributaries Left: | Olteana |
The Șucu (in its upper course also: Șuculețu) is a left tributary of the river Bistra Mărului in Romania. It flows into the Bistra Mărului in Poiana Mărului.[1] Its length is 16km (10miles) and its basin size is 79km2.