Ronaldo Aparecido Rodrigues (born 10 September 1982), commonly known as Naldo, is a Brazilian professional footballer who primarily plays as a centre back. From 2007 to 2009, he made four appearances for the Brazilian national team.
Naldo began his football career playing for RS Futebol at the youth level before playing for them professionally. After two years at RS Futebol, Naldo joined Juventude for one season, where, playing alongside Thiago Silva, he made thirty-six appearances and scored eight goals.
His talent in Brazil led to Naldo signing with Werder Bremen in the summer of 2005, to replace Valérien Ismaël who left for Bayern Munich for €3 million and shortly after was given the number four shirt. Furthermore, he was capable of playing across the back line. In the opening game of the season, Naldo made his debut in a 5–2 win over Arminia Bielefeld. His first goal came in November 2005, in a 6–1 win over Wolfsburg. After missing one match, due to injury, Naldo scored his second goal of the season, in a 4–1 win over FC Köln on 11 December 2005. In his first season, Naldo played in all but two of Bremen's Bundesliga games and in seven of their eight Champions League fixtures, along with two appearances in Champions League Qualifiers.