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Lennart Stekelenburg (born 22 October 1986) is a Dutch swimmer who specialises in breaststroke. He is the current national record holder in the 50 m, 100 m and 200 m breaststroke at the long course and is part of the 4 × 100 m relay team who hold the Dutch long course record.
Stekelenburg qualified for the 2009 World Aquatics Championships during the Swim Cup Eindhoven 2008, in early December, with a national record at the 100 m breaststroke. One week later he took part in the European Short Course Swimming Championships 2008 in Rijeka, Croatia where he ended 8th in the 100 m breaststroke but was eliminated in the heats of the 50 m and 200 m breaststroke.