Martin Pacek (born 28 April 1987 in Kristianstad) is a Swedish judoka. He competed at the 2016 Summer Olympics in the men's 100 kg event, in which he was eliminated in the second round by Cho Gu-ham.
Pacek's father Ryszard Pacek was a Polish Greco-Roman wrestler who emigrated to Sweden in the late 1970s. His younger brother Robin is also a judoka.