Willi Büsing was a German three-day eventer who won a team silver medal and individual bronze medal on Hubertus at the 1952 Helsinki Olympic Games. In 1954 the German team came in second at the European Championships. From 1945 Büsing was a veterinary surgeon in Jade. He was also involved in horse breeding, was active as a referee at international tournaments and was chef de mission, coach and veterinarian of the German equestrian teams at the 1956-64 Olympic Games and the 1966 European Championships in Moscow.
As of 2021, Büsing is the oldest surviving male medalist from the 1952 Helsinki Olympic Games, the oldest lived German Olympic medalist, and the oldest rider to win two Olympic medals. That year, Büsing celebrated his 100th birthday with his wife Dorle, who was 18 years his junior and with whom he has been married for 62 years, and his two daughters, Sabine and Heike.