Benevenuto Martins Nuñes (born 27 June 1913, date of death unknown) was an Olympic freestyle and backstroke swimmer from Brazil, who participated at two Summer Olympics for his native country.

[1][2][3][4] At the 1932 Summer Olympics in Los Angeles, he swam the 4×200-metre freestyle, finishing 7th in the final, along with Manoel Lourenço, Isaac Moraes and Manoel Villar.

[3][5] He also swam the 100-metre backstroke, not reaching the finals.

[4] At the 1936 Summer Olympics in Berlin, he swam the 100-metre backstroke, not reaching the finals.

This biographical article related to a Brazilian swimmer is a stub.