The 2020 Rio de Janeiro municipal election took place in the city of Rio de Janeiro, Brazil in November 2020 to elect a mayor, a vice mayor, and 51 city councillors for the administration of the city. On the 29 November 2020 run-off election, former mayor Eduardo Paes, of the Democrats (DEM), defeated incumbent mayor Marcelo Crivella of the Republicans (REP), who lost his bid for re-election.

Eduardo da Costa Paes is a Brazilian politician who became the mayor of Rio de Janeiro from 2009 to 2012, reelected for a second term from 2013 to 2016 and a third in 2021. He is the city's 13th mayor. On 12 August, at the 2012 Summer Olympics closing ceremony, he took the Olympic Flag, via Jacques Rogge, from London Mayor Boris Johnson.