Fla Flu (a truncation of Flamengo Fluminense) is an association football match between cross-town rivals Flamengo and Fluminense. Matches take place in the 78,000-seat Maracan Stadium, located near downtown Rio de Janeiro, in the city's Maracan district.

Flamengo has several nicknames  Rubro-Negro, Mengo and Fla among them  but the most far-reaching is O Mais Querido do Brasil, which translates to The Most Beloved in Brazil.