María Gabriela Díaz (born 2 January 1981 in Alta Gracia, Córdoba) is an Argentine professional BMX cyclist.

[2][3] She also won two medals, including a prestigious gold, in the same category at the Pan American Games (2007 and 2011), and later represented her nation Argentina at the 2008 Summer Olympics.

[4] At the 2007 Pan American Games in Rio de Janeiro, Brazil, Diaz powered her lead over the eight-strong female squad on the final stretch to take home the first gold for Argentina in the women's BMX category, finishing ahead of host nation's Ana Flávia Sgobin.

[7] After grabbing a fifth seed on the morning prelims with a time of 37.590 and then mounting a third spot in her semifinal heat with 13 placing points, Diaz narrowly missed out the podium by more than a second with a fifth-place finish in 39.747.

[8][9][10] At the 2011 Pan American Games in Guadalajara, Mexico, Diaz could not defend her women's BMX title with a bronze-medal time in 42.971, holding off her sister Mariana on the final turn by a two-second advantage.