Katyn may refer to:
- Katyn massacre, a mass execution of Polish citizens in 1940
- Katyń (film), a 2007 Polish film about the Katyń massacre directed by Andrzej Wajda
- Katyn (rural locality), a selo in Smolensk Oblast, Russia, and the site of the Katyn massacre
- Katyń Memorial, Jersey City, New Jersey, dedicated to the victims of the Katyn massacre
- Katyn war cemetery, a Polish military cemetery in the village of Katyn, Smolensk Oblast, Russia