| Rătășel | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Bihor County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Cociuba Mare |
| Length: | 33km (21miles) |
| Mouth: | Crișul Negru |
| Mouth Location: | Tăut |
| Mouth Coordinates: | 46.7263°N 21.8469°W |
| Basin Size: | 106km2 |
The Rătășel is a left tributary of the Crișul Negru in Romania. It flows into the Crișul Negru near Tăut. Its length is 33km (21miles) and its basin size is 106km2.