Guenter Seidel (born 23 September 1960) is an American equestrian. He was born in Bavaria, Germany, but represents the United States after moving to the country in 1985. He won a bronze medal in team dressage at the 1996 Summer Olympics in Atlanta, together with Robert Dover, Michelle Gibson and Steffen Peters. He also won bronze medals in team dressage at the 2000 Summer Olympics in Sydney, and at the 2004 Summer Olympics in Athens. He is openly gay.