Morgan Lake (born 12 May 1997) is a British track and field athlete, specialising in multi-event disciplines and the high jump. She is the 2014 World Junior champion in heptathlon and high jump, and the 2015 European Junior champion in high jump.
Lake broke the 29-year-old UK Under 17 high jump record, clearing 1.90 m in 2013, and broke the 23-year-old UK Under 20 high jump record with 1.93m in 2014. She also broke the world indoor pentathlon youth (under-18) record in 2014, with a score of 4284 points. At the 2016 Olympic Games in Rio, she became the first British woman to reach an Olympic high jump final since Debbie Marti in 1992. In 2018, she finished fourth at the World Indoor Championships and won her first major senior silver medal at the Commonwealth Games.
Born in Reading, Berkshire, England, Lake began to compete competitively as an under-13 in 2008 at Slough Juniors Athletics Club. In 2009, she broke the UK under-13 pentathlon record with 3,046 points. In 2011, she broke the under-15 record with 3,755 points. At the English Schools Championships, she won the pentathlon and long jump in 2010 (under-15) and the long jump in 2012 (under-17). In 2013, she finished second at the British Indoor Championships in the high jump.