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, Viti, a village in southern Kosovo Letnica (river), a river of Poland
See also Ohrid trout (Salmo letnica), a species of fish Letnitsa, a town in northern Bulgaria