Krzysztof Raczkowski (October 29, 1970 – August 20, 2005), also known as Docent or Doc, was a Polish drummer, best known as a member of Polish death metal bands Vader (1988–2005) and Dies Irae. He also appeared as a guest or temporary musician in Sweet Noise, Hunter, Slashing Death, Unborn, Moon, and Overdub Trio.