Castle Rat is an American doom metal band formed in Brooklyn, New York, in 2019. Known for their "medieval fantasy doom metal" aesthetic, they blend traditional doom and heavy metal with theatrical live performances inspired by Black Sabbath and Frank Frazetta's fantasy artwork. Led by vocalist and rhythm guitarist Riley Pinkerton, the band gained recognition for their debut album Into the Realm (2024) and elaborate stage shows featuring their nemesis, "The Rat Reaperess".