Manfred Unterweger (born October 29, 1980 in Ehenbichl) is an Austrian ice hockey defenceman currently playing for EHC Black Wings Linz in the Austrian Hockey League.

Unterweger has previously played for HC TWK Innsbruck, Graz 99ers and EC Red Bull Salzburg. He joined 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.

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