Marco Antônio Barroso Nanini (born 31 May 1948) is a Brazilian actor.

Nanini achieved national sensation through his participation in the theatre piece "O Mistério de Irma Vap", together with fellow actor and friend Ney Latorraca.

It was one of the biggest box office successes in Brazil, staying for 11 consecutive years with the same casting (a Guinness World Record).

In 2011, Nanini spoke at the first time about his sexuality to a Brazilian magazine, addressing questions on the subject: "Oh, it's going well, sometimes a young man appears, sometimes not, but I'm okay."

declared the actor, who lives with producer, Fernando Libonati in Rio de Janeiro, Brazil.