Marjorie Gestring (November 18, 1922 – April 20, 1992) was a competitive springboard diver from the United States.
At the age of 13 years and 268 days, she won the gold medal in 3-meter springboard diving at the 1936 Summer Olympics in Berlin, making her, at the time, the youngest person ever to win an Olympic gold medal.
(She remains the second-youngest winner.) A multi-time national diving champion in the United States, she was given a second Olympic gold medal by the United States Olympic Committee after the 1940 Summer Olympics were called off due to the advent of World War II.
Gestring attempted to return to the Olympics at the 1948 Games, but failed to qualify for the US team.
She has been inducted into the International Swimming Hall of Fame and the Stanford Athletic Hall of Fame.