Mário Caetano Filho, better known as Marinho (born 27 February 1955) is a Brazilian former professional football player who played as a centre-back.
Viewed as a valuable prospect, he caught the attention of São Paulo who he played for on loan in 1977.
Marinho played alongside Zico, Júnior and Leandro and was part of the team that won the 1981 Copa Libertadores de América and 1981 Intercontinental Cup.
Marinho and centre-back partner Mozer were in the starting lineup in the third and decisive match against Cobreloa in the 1981 Libertadores final.
Marinho played for the Brazil national team in 1983 under manager Carlos Alberto Parreira in friendlies against Chile and the "Seleção Gaúcha" (selection from the state of Rio Grande do Sul).