Ketrzyn (German: Rastenburg, from Lithuanian and Old Prussian Raistpilis — "a castle in the swamps"); 1945-1946 ), is a town in northeastern Poland with 28,351 inhabitants (2004). Situated in the Warmian-Masurian Voivodeship (since 1999), Ketrzyn was previously in Olsztyn Voivodeship (1975–1998). It is the capital of Ketrzyn County. The city was named after Wojciech Ketrzynski in 1946.