Kristin Otto

East German Kristin Otto's 6 gold medals at the 1988 Seoul Olympics — across freestyle, backstroke, and butterfly events — is the record for gold medals won by a female swimmer in a single Games. She won gold in the 100m freestyle, 100m backstroke, 100m butterfly, 50m freestyle, 4x100m freestyle, and 4x100m medley relay, a feat of versatility never equalled before or since in Olympic swimming history.