Dietmar Koszewski (born 26 July 1967 in Berlin) is a retired German hurdler.
He won a bronze medal for West Germany at the 1990 European Championships in Athletics in Split and the gold medal at the 1993 Summer Universiade in Buffalo.
His personal best was 13.41 seconds, achieved in July 1990 in Hamburg. This ranks him ninth among German 110 m hurdlers, behind Florian Schwarthoff, Mike Fenner, Eric Kaiser, Falk Balzer, Thomas Blaschek, Sven Göhler, Thomas Munkelt and Holger Pohland. https://web.archive.org/web/20070704081712/http://www.leichtathletik.de/dokumente/ergebnisse/images/ewige_dlv_bestenliste.pdf