Aloysio Nunes Ferreira Filho (born 5 April 1945) is a Brazilian lawyer and politician. A member of PSDB, Nunes was a senator from São Paulo from 2011 to 2017, and was Brazil's Minister of Foreign Affairs from 2017 to 2018.

Aloysio Nunes attended the University of São Paulo Law School in the 1960s when he got involved into politics, associated with the Brazilian Communist Party. During the military dictatorship he participated in protests against the regime. Later he was exiled in Paris, France.

In 1979 he was able to return to Brazilian soil due to the Amnesty Law, that pardoned the oppositionist political militants. He de-affiliated from the Brazilian Communist Party and joined the Brazilian Democratic Movement Party. In 1982 he was elected deputy in São Paulo. The dictatorship ended in 1985.

In 1990 he was elected vice governor of São Paulo. He governed the state in a few occasions, when the governor was travelling or in each case, absent.

He was candidate for mayor of the city of São Paulo in 1992, but lost to Paulo Maluf.

He was elected federal deputy in 1994. In 1997 he left the party and joined the Brazilian Social Democracy Party. He was a special aide to president Fernando Henrique Cardoso and later his minister of justice.

He worked in the governments of José Serra in the city and the state of São Paulo.

In 2010 he was elected the senator with the highest number of votes in the history of Brazil, with astonishing 11.189.168 votes (30.4%).