Norwegian speed skater who, with Clas Thunberg (Thunberg, Clas) of Finland, dominated speed-skating competitions in the 1920s and '30s. He won seven Olympic medals in his career, as well as four world championships and four European championships.

Ballangrud's Olympic debut came at the 1928 Games in Saint Moritz, Switzerland, where he took home the gold medal in the 5,000-metre event and a bronze in the 1,500-metre event. At the 1932 Winter Olympics in Lake Placid, New York, U.S. (Olympic Games), his performance suffered from a lack of familiarity with the pack-style racing that was common in North America, and he managed only a silver medal in the 10,000-metre race. Ballangrud, who was always strong in the long distances, became a good sprinter later in his career. At the 1936 Winter Olympics in Garmisch-Partenkirchen, Germany, he won gold in a sprint event (500 metre) and two distance events (5,000 and 10,000 metre). He also won a silver medal in the 1,500-metre race.

Ballangrud's finest year in competition was 1936. In addition to winning three gold medals at that year's Olympics, Ballangrud also captured the world and European championships. He was a stranger to neither, however, having been world champion in 1926, 1932, and 1938, as well as European champion in 1929, 1930, and 1933.