Mário dos Santos

Mário José dos Santos Júnior (born 10 September 1979 in Cubatão, São Paulo) is a male race walker from Brazil. He competed for his native country in two consecutive Summer Olympics, starting in 2004 (Athens, Greece).

He won the 50 km section of the 2012 South American Race Walking Championships with a time of 4:12:52 hours.