Maria Beatriz Mendoza Rivera (born November 18, 1975 in Santa María de Guía) is a track and field athlete from Spain. She has a disability: She is blind and a T12/B2 type athlete. She raced at the 1996 Summer Paralympics. She finished first in the 100 meter T12 race and she finished first in the 200 meter T12 race. She raced at the 2004 Summer Paralympics and finished second in the 200 meter race and third in the 100 meter race.