Ronaldo de Assis Moreira (born March 21, 1980 in Porto Alegre), commonly known as Ronaldinho or Ronaldinho Gaúcho,^[3] is a Brazilian footballer who plays for Italian Serie A club A.C. Milan and the Brazil national team.

Ronaldinho, Portuguese for "little Ronaldo", is known in Brazil by the nickname Ronaldinho Gaúcho, in order to distinguish him from Ronaldo, who was already called "Ronaldinho" in Brazil. Ronaldo simply went by his first name upon his move to Europe, thereby allowing Ronaldinho to drop the "Gaúcho" and remain simply as Ronaldinho.

He has played for Paris Saint-Germain, and FC Barcelona, with whom he won his first Champions League in 2006. He became a Spanish citizen in January 2007.^[4]