Finnish cross-country skier who earned seven Olympic medals in three Olympic competitions between 1952 and 1960. He also won world championships in the 15-km event in 1954 and 1958.

A woodchopper by trade, Hakulinen proved to be a versatile skier at all distances. His first medal was earned at the 1952 Winter Olympics in Oslo, Norway, when he won the gold in the 50-km race by the impressive margin of nearly five minutes. His second individual gold medal was awarded in the 30-km race at the 1956 Games in Cortina d'Ampezzo, Italy. Silver medals in the 50-km race (1956 and 1960) and a bronze in the 15-km race at the 1960 Games filled out his individual awards.

Excitement came when Hakulinen anchored Finland's 4×10-km relay team at the 1960 Games in Squaw Valley, California, U.S. The teams from Norway and Finland were tied halfway through the race, and Norway eventually took a large 20-second lead. Hakulinen overtook Norway's Håkon Brusveen twice in the last 10 km, ultimately winning by a scant 0.8 second and securing the gold medal for Finland. Hakulinen was also the anchor for the relay team that took the silver medal in 1956.