Roxana Tomasa Díaz Sánchez (born May 17, 1981, in Melena del Sur, Havana) is a female track and field sprinter from Cuba.

Her personal best in the women's 200 metres is 22.68, achieved on July 4, 2007, at a meet in Salamanca.

Díaz is a two-time Olympian (2004 and 2008).

Outdoor Indoor

This biographical article relating to Cuban athletics is a stub.