Kadyny (German: Cadinen) is a town in North-Eastern Poland in Warminsko-Mazurskie Voivodship near the city of Tolkmicko. Kadyny used to be a residence of the Hohenzollern Prussian kings, emperors.

Legend has it that Kadyny was named after Cadina, a daughter of a Prussian chief.

Kadyny is one of the breeding sites for Trakehner horses.