Dag Bjørndalen (born 2 April 1970) is a former Norwegian biathlete.

He is the older brother of Ole Einar Bjørndalen.

His biggest triumph as a biathlete is the silver medal he won in the relay in the 1998 Olympics in Nagano (together with his brother Ole Einar, Halvard Hanevold and Egil Gjelland).

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