Jazmin Roxy "Jazz" Carlin (born 17 September 1990) is a British competitive swimmer, who represents Wales and the Great Britain swimming team. She competes primarily in freestyle events, and is currently based at the University of Bath. She won silver for Wales at the 2014 Commonwealth Games, and two silver medals for Great Britain in the 2016 Summer Olympics.
Carlin was born in Swindon, Wiltshire, England. She moved to Swansea, Wales, with her parents (both of whom have Welsh heritage) in 2006, to train at the Wales National Pool. In her international debut at the European Short Course Swimming Championships 2005 in Trieste, Italy, Carlin failed to qualify past the heats of the 200 and 400-metre freestyle. At the 2006 Commonwealth Games in Melbourne, Australia, competing for Wales, she finished eighth in the 800-metre freestyle and finished third in the heats of the 400-metre freestyle. Together with Bethan Coole, Julie Gould and Cari-Fflur Davies she finished sixth in the 4 × 200 m freestyle relay. At the 2008 European Short Course Swimming Championships in Rijeka, Croatia, Carlin was eliminated in the heats of the 200 and 400 metre freestyle. At the 2009 World Aquatics Championships in Rome, Italy, Carlin, along with Joanne Jackson, Caitlin McClatchey and Rebecca Adlington won the bronze medal in the 4x200-metre freestyle relay with a time of 7:45.51, a European record. At the 2010 Commonwealth Games, Carlin won a silver medal in the women's 200-metre freestyle and a bronze medal in the women's 400-metre freestyle.