From Jesse Owens winning the 100m in Berlin in 1936 to Sir Steve Redgrave's fifth gold at Sydney 2000, the Olympic Games have produced countless moments of unforgettable drama.
Choose Bob Beamon's 29ft 2½ inches leap at the 1968 Mexico Games or Carl Lewis' four track and field titles in Los Angeles in 1984.
Derek Redmond's heart-rending performance at the 1992 Barcelona Games, Nadia Comaneci's three gymnastic titles at Montreal 1976 or Cathy Freeman's emotional 400m run in 2000.
Or perhaps Muhammad Ali's light heavyweight gold at Rome 1960, Mark Spitz's seven swimming golds at Munich 1972 or Daley Thompson's two decathlon golds in 1980 and 1984.
Send us your favourite Olympic moments and watch out for "The 50 Greatest Olympic moments", to be shown on the BBC in August.
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The defining images