Marat Mansurovych Deviatiarov (; born 19 April 1994 in Kharkiv) is a Ukrainian former tennis player.
Deviatiarov has a career-high singles ranking by the ATP of 538, achieved on 25 May 2015. He also has a career-high ATP doubles ranking of 315, achieved on 25 September 2017.
Deviatiarov has represented Ukraine at the Davis Cup, where he has a win/loss record of 1âÂÂ0.