Ronaldo Fonseca de Souza (born 4 April 1959 in Volta Redonda) is a Brazilian lawyer and politician, member of the Republicans (REP).

[2] In December 2013, deputy Ronaldo Fonseca defended the reduction of taxes in Brazil.

Ronaldo is author of a proposal of amendment of the Constitution which extend tax immunity of churches, political parties, and other institutions.

Considered Cunha's ally, Fonseca presented a 69 pages report asking for a new voting.

[5] In August 2017, voted for the rejection of the denounce of passive corruption against president Temer, which approval rating was the worse since the military dictatorship.