Manfred Unterweger (born October 29, 1980 in Ehenbichl) is an Austrian ice hockey defenceman who last played for ATSE Graz in the Austrian Oberliga in 2009-10.
Unterweger previously played for HC TWK Innsbruck, Graz 99ers and EC Red Bull Salzburg, before joining EHC Black Wings Linz in 2006 where he became a regular in the Black Wings' blueline. However in 2007-08, he only managed to play just five games. In 2008-09, he was a member of Kapfenberger SV in the Austrian Nationalliga.