Dag Bjørndalen (born April 2, 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). He was also part of the team that won the team event in the 1995 World Championships.