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|Olympic medal record|
|Competitor for Norway|
|Gold||1976 Montreal||Double sculls|
|Silver||1988 Seoul||Quadruple sculls|
|Gold||1975 Nottingham||Double sculls|
|Gold||1978 Hamilton||Double sculls|
|Gold||Bled 1979||Double sculls|
|Gold||Luzern 1982||Double sculls|
|Silver||1974 Luzern||Double sculls|
|Silver||1983 Duisburg||Double sculls|
|Silver||1987 Copenhagen||Quadruple sculls|
|Bronze||1970 St. Catharines||Coxless fours|
|Bronze||1981 Munich||Double sculls|
In 1976, he won a gold medal at the Montreal Olympic Games in the Men's Double Scull event (2x) with his brother Frank Hansen. The Hansen brothers started their outstanding career with a Silver Medal at the 1974 World Championships, and followed that up with a Gold Medal at the 1975 World Championships. They would go on to win the 1978 and 1979 World Championships in the Double Scull. In the Montral Olympics they won the Gold Medals in the same boat. Unfortunately the Norwegian Rowing federation banned the Olympics in Moscow in 1980, so the brothers was unable to defend their Gold Medal during those games. His brother Frank Hansen officially retired after the games in Moscow. Alf continued his career with a new partner and won gold then silver at the World Championships together with Rolf Thorsen in 1982 and 1983. He further won a silver medal in the olympic games in Seoul in 1988 and ended his professional career after the Worlds in 1991, he was then 43 years old.
Alf was awarded the Thomas Keller Medal in 1990. The medal is given by the International Rowing Federation (FISA) for an outstanding international career in the sport of rowing. It is the highest honor in rowing and is awarded to any athlete within five years of his/her retirement from the sport. It recognizes an exceptional rowing career as well as exemplary sportsmanship.
- "Alf Hansen". Sports-reference.com. Retrieved 4 May 2010.