Coordinates: 55°09′16″N 20°51′10″E / 55.15444°N 20.85278°E
Rybachy (Russian: Рыба́чий, from Рыба́к, "Fisherman"), before 1946 known as Rossitten in East Prussia (Lithuanian: Rasytė), is a rural settlement in Zelenogradsky District of Kaliningrad Oblast, Russia, located on the Curonian Spit. It was formerly known for the Rossitten Bird Observatory and the Rossitten gliding school.
Rybachy is the largest settlement on the Russian side of the Curonian Spit between the Curonian Lagoon and the Baltic Sea, close to the border with Lithuania. It is the administrative seat of the Kurschskaja Kossa (Curonian Spit) municipality. As of 2010 it has about 839 residents.
A Teutonic Ordensburg on the road from Königsberg to Memel was first mentioned in 1372. It had been the site of a Curonian fishing village, named after Old Prussian rosit ("dew", cf. Lithuanian: Rasa). Constantly threatened by coastal dunes the settlement had to be relocated several times until their migration was stopped by large-scale afforestation in the 19th century.