Marat Mikhailovich Safin (Marat Mubin ulı Safin; Мара́т Миха́йлович (Муби́нович) Са́фин /mɑ.ˈrɑt.ˈsɑ.fɪn/; b. January 27, 1980) is a Russian former World No. 1 tennis player of Tatar ethnicity. He speaks Russian, English and Spanish.

Safin began his professional career in 1997 and held the No. 1 world ranking for 9 weeks in November and December of 2000. He achieved his first Grand Slam title at the 2000 U.S. Open after defeating Pete Sampras, and later won the 2005 Australian Open defeating Lleyton Hewitt. Safin also helped lead Russia to Davis Cup victories in 2002 and 2006.