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.
In March 2005, Krzysztof Raczkowski left Vader. Piotr Wiwczarek, the band's lead singer, said in an official statement on their website:
Maurycy Stefanowicz, the guitarist of the band, mentioned Krzysztof's problem with alcohol in an interview in April 2005.