Bernt Assar Rönnlund (3 September 1935 – 5 January 2011) was a Swedish cross-country skier. Rönnlund's biggest success was at the 1962 FIS Nordic World Ski Championships in Zakopane where he won two gold medals (15 km and 4 × 10 km) and a silver (50 km). As a result, he earned the Svenska Dagbladet Gold Medal that year for his championship successes. Rönnlund was the anchorman of the Swedish 4 × 10 km relay team at the 1964 Winter Olympics in Innsbruck, bringing the team from fourth place to victory. Rönnlund also won the Vasaloppet in 1967 and the 50 km event at the Holmenkollen ski festival twice (1962 and 1968). For his cross-country skiing successes, Rönnlund was awarded the Holmenkollen Medal in 1968 (shared with King Olav V, Gjermund Eggen and Bjørn Wirkola).