| Kačupys | |
| Pushpin Map: | Lithuania |
| Source1 Coordinates: | 55.423°N 23.7926°W |
| Mouth Coordinates: | 55.3945°N 23.8511°W |
| Progression: | Dotnuvėlė→ |
| Subdivision Type1: | Country |
| Subdivision Type2: | Region |
| Basin Size: | 10.2km2 |
The Kačupys is a river of Kėdainiai district municipality, Kaunas County, central Lithuania. It is the right tributary of the Dotnuvėlė river. It starts from the Krakės-Dotnuva forest, then goes through Siponiai and meets the Dotnuvėlė nearby Vainotiškiai village.
The name Kačupys means 'Cat River' (i. e. is could mean 'petty, inferior river').