Letnica may refer to:
- Letnica, Gdańsk, one of the quarters of the city of Gdańsk, Poland
- Letnica, Lubusz Voivodeship, a village in western Poland
- Letnica, West Pomeranian Voivodeship, a village in northwestern Poland
- Letnica, a village in the Vitina municipality of southern Kosovo
Letnica is a river of Poland, a tributary of the Obra.
Category:Rivers of Poland