Marat Mansurovych Deviatiarov (Ukrainian: Марат Мансурович Дев'ятьяров; 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 1–0.

This biographical article relating to Ukrainian tennis is a stub.