Siegfried "Sigi" Grabner (born 4 February 1975, in Waiern, Carinthia) is an Austrian professional snowboarder.

At the 2006 Winter Olympics in Turin, Italy he won bronze in the Parallel Giant Slalom competition.

He won the European Championship 1995 in Finland, and became part of the Burton Alpine Team.

In 2003 he won the Parallel Giant Slalom World Championship in Kreischberg, Austria.

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