Gregory "Greg" Efthimios Louganis (born January 29, 1960) is an American Olympic diver and author.
He received the James E. Sullivan Award from the Amateur Athletic Union (AAU) in 1984 as the most outstanding amateur athlete in the United States.
Louganis is of Samoan/Swedish descent. He was raised in California by his adoptive parents, a Greek-American couple. He attended Santa Ana High School and Valhalla High School in El Cajon, California.