| Official Name: | Gelnai |
| Settlement Type: | Village |
| Pushpin Map: | Kėdainiai District Municipality#Lithuania |
| Pushpin Map Caption: | Location in Lithuania |
| Subdivision Name: |  Lithuania |
| Subdivision Type1: | County |
| Subdivision Name1: | Kaunas County |
| Subdivision Type2: | Municipality |
| Subdivision Name2: | Kėdainiai district municipality |
| Subdivision Type3: | Eldership |
| Subdivision Name3: | Pelėdnagiai Eldership |
| Population As Of: | 2011 |
| Population Total: | 47 |
| Timezone: | EET |
| Utc Offset: | +2 |
| Timezone Dst: | EEST |
| Utc Offset Dst: | +3 |
| Coordinates: | 55.1419°N 23.9781°W |
Gelnai (formerly Russian: Гельны, Polish: Giełny) is a village in Kėdainiai district municipality, in Kaunas County, in central Lithuania. According to the 2011 census, the village had a population of 47 people. It is located from Vandžiogala, by the Mėkla river and its tributary the Klampis, next to the A8 highway, nearby the Labūnava Forest.
There is an agroservice, a wayside chapel (cultural heritage object), a cemetery and many wooden sculptures made by local wood carver.
In the beginning of the 20th century, there was Gelnai village and zaścianek in Babtai volost.