Lewis Clareburt (born 4 July 1999) is a New Zealand swimmer. He is the current 2024 400m Individual Medley World Champion (4:09.72) and Commonwealth men's champion for 200 metre butterfly and 400 metre individual medley, having won both events at the 2022 Commonwealth Games. At the 2018 Commonwealth Games and the 2019 World Aquatics Championships, he won bronze medals in the men's 400 m individual medley. He swam in the 2020 International Swim League, competing for the New York Breakers. He is coached by Mitch Nairn at Club 37, Auckland.
In the second ISL season overall Lewis competed for the US-based swim team – New York Breakers.