Mariya Olehivna Muzychuk (; born 21 September 1992) is a Ukrainian chess grandmaster and Women's World Chess Champion from April 2015 to March 2016. She is also a twice women's champion of Ukraine (2012, 2013), World Team and European Team champion with Ukraine in 2013 and bronze medal winner of the 2012 and 2014 Chess Olympiad with Ukraine.