| Rudekšna | |
| Source1 Location: | Gružai Forest |
| Mouth Coordinates: | 55.3225°N 24.3698°W |
| Subdivision Type1: | Country |
| Subdivision Type2: | Region |
| Length: | 20.8km (12.9miles) |
| Basin Size: | 41km2 |
| Tributaries Left: | Geležė |
The Rudekšna is a river of Kėdainiai district municipality, Kaunas County, central Lithuania. It flows for and has a basin area of 41km2.
It starts nearby the Gružai Forest, on the Ukmergė District Municipality and Panevėžys District Municipality limits. The Rudekšna flows southwards and meets the Obelis river (from the right side) nearby Runeikiai village. Pagiriai town stands by the Rudekšna. The name Rudekšna is derived from Lithuanian: rudas ('brown').