Laviai Nielsen
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Laviai Nielsen (born 13 March 1996) is a British sprinter. She competed in the women's 400 metres at the 2017 European Athletics Indoor Championships, finishing in fourth place in the final. Nielsen has an identical twin sister, Lina Nielsen, who is also an international athlete in the same events.

At 16, Nielsen was a bag carrier for British heptathlete Jessica Ennis at the 2012 London Olympic games, a pivotal experience in her development as an athlete. "I stood behind Jessica Ennis and when she came out the crowd cheering was the loudest thing I've heard in my life," she later recalled. "I thought, 'I want that'."

Nielsen was initially a middle distance runner, but in 2013 she and her twin sister were approached at an event and persuaded to change specialism to the 400 metres. Laviai proceeded to reduce her 400m personal best by 2 seconds within 2 months, and a further four seconds by the following season.