Fla–Flu is an association football derby between Flamengo and Fluminense, considered one of the biggest rivalries in Brazilian football. Their matches usually take place at the famous Maracanã Stadium, located near downtown Rio de Janeiro, in the Maracanã district. The Fla–Flu holds the world's record football match attendance of 194,603 people in a 1963 derby.

Clube de Regatas do Flamengo, more commonly referred to as simply Flamengo, is a Brazilian multi sports club based in Rio de Janeiro, in the neighborhood of Gávea, best known for their professional football team. They are one of two clubs to have never been relegated from the top division. Flamengo is the most popular team in Brazil with more than 46.9 million fans, equivalent to 21.9% of the population that supports a team in Brazil.