Duque de Caxias (Portuguese pronunciation: [ˈduki dʒi kaˈʃiɐʃ], Duke of Caxias) is a city on Guanabara Bay and part of Rio de Janeiro metropolitan area, being the 3rd most city populous in Rio de Janeiro state, southeastern Brazil.
It is bordered by Rio de Janeiro city to the south. Its population was 924,624 (2020) and its area is 465 km2, making it the second most populous suburb of Rio de Janeiro city. The city is the third most populous in Rio de Janeiro Metropolitan Area. The current mayor is Washington Reis.
It is named after Luís Alves de Lima e Silva, Duke of Caxias, who was born there in 1803. The city is the seat of the Roman Catholic Diocese of Duque de Caxias. Its important industries are chemicals and oil refining.
Duque de Caxias Futebol Clube is the local football team of the city. The club plays their home matches at Estádio Romário de Souza Faria, which has a maximum capacity of 10,000 people.