1966 Campeonato Carioca

The 1966 edition of the Campeonato Carioca kicked off on September 11, 1966 and ended on December 18, 1966. It was organized by FCF (Federação Carioca de Futebol, or Carioca Football Federation). Twelve teams participated. Bangu won the title for the second time. no teams were relegated.

System
The tournament would be divided in two stages:
 * First round: The twelve teams all played in a single round-robin format against each other. The eight best teams in each group qualified to the Second round.
 * Second round: The remaining eight teams all played in a single round-robin format against each other. The team with the most points won the title.