Sir Steven Geoffrey Redgrave (born 23 March 1962) is a British retired rower who won gold medals at five consecutive Olympic Games from 1984 to 2000. He has also won three Commonwealth Games gold medals and nine World Rowing Championships golds. He is the most successful male rower in Olympic history, and the only man to have won gold medals at five Olympic Games in an endurance sport.

Redgrave is regarded as one of Britain's greatest-ever Olympians. Celebrated as the most decorated and successful British Olympian in history at the time of his retirement in 2000, as of 2025 he is the fifth-most successful British Olympian, after cyclists Sir Chris Hoy, who was the first British Olympian to break his record in 2012, Sir Jason Kenny, who took on the record himself in 2020, Sir Bradley Wiggins who briefly took his title as the most decorated British Olympian in 2012, and Dame Laura Kenny, the only British woman to have won five Olympic gold medals; Redgrave is the only one of the five was not a track cyclist. He has carried the British flag at the opening of the Olympic Games on two occasions. In 2002, he was ranked number 36 in the BBC poll of the 100 Greatest Britons. He received the BBC Sports Personality of the Year – Lifetime Achievement Award in 2011.

Although he raced in a series of different pairs and foursomes, Redgrave's career is most closely associated with long-term colleague and fellow knight of the realm, Sir Matthew Pinsent, with whom he won three of his Olympic gold medals, and seven of his World Championship titles.

Redgrave was born in Marlow, Buckinghamshire, to Geoffrey Edward Redgrave, a submariner in the Second World War who became a builder, and Sheila Marion, daughter of Harold Stevenson, a local bus driver. His great-grandparents Harry and Susannah Redgrave moved to Marlow from Bramfield, Suffolk, in 1887. He was educated at Great Marlow School.

Redgrave's primary discipline was sweep rowing, in which he won Olympic Gold rowing both bowside and strokeside (port and starboard).^{[citation needed]}

From 1991, the crews in which he rowed became renowned for their consistent dominance, winning almost every time they raced. Profiles of the Redgrave-Pinsent pairing in particular reflected their perceived invulnerability, arguing "the best pair in the world today is Steve Redgrave, and whomever Steve Redgrave chooses to row with. The second best pair is Matthew Pinsent, and whomever Matthew Pinsent chooses to row with"; the pair were not only widely considered the best pair in the world at their peak, but the best two individual sweep rowers.

For much of his career he suffered illness: in 1992 he was diagnosed with ulcerative colitis, and in 1997 he was diagnosed with diabetes mellitus type 2.

Redgrave won gold medals at five consecutive Olympic Games from 1984 to 2000, plus a bronze medal at the 1988 Summer Olympics.