Swedish skiing champion who competed in two Olympics, winning two gold and two silver medals in Nordic competition.

Small in stature, Gustafsson compensated for her short stride length with unusually powerful strokes that provided her more stamina at the end of races. A housewife and physical education teacher, her first Olympic experience was at the 1964 Olympic Games in Innsbruck, Austria. There she won a silver medal as a member of the 3×5-km relay team. At the 1968 Olympics in Grenoble, France, the same Swedish threesome—with Gustafsson recording the fastest leg of the competition—repeated as silver medalists in the 3×5-km race. She led a Scandinavian sweep of medals (Norwegians took silver and bronze) in the individual 10-km race, winning by over a minute. Gustafsson's finest Olympic performance came in the 5-km race. The last skier to start, she struggled for most of the race, trying to keep up with the pace set by the great Soviet skier Galina Kulakova (Kulakova, Galina). Trailing by four seconds, Gustafsson put forth an inspired effort in the final kilometre of the race to make up seven seconds on Kulakova and win the race by three seconds. The victory made her the first Swedish woman to garner two gold medals at one Winter Olympics. After the 1968 Games, she married Assar Rönnlund, also a cross-country skier.