Kjersti Østgaard Buaas (born 5 January 1982) is a Norwegian snowboarder from Trondheim.

She placed 4th in women's half-pipe at the 2002 Winter Olympics in Salt Lake City, United States.

She received a bronze medal at the 2006 Winter Olympics in women's half-pipe in Turin, Italy.

Buaas recovered from a broken leg only a week before her bronze-winning ride.

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