Duque de Caxias (Duke of Caxias) is a city in southeast Brazil in Rio de Janeiro, bordered by Rio de Janeiro (city) to the south. Its population was 842,890 (2005) and its area is 465 km², making it the second most populous suburb of Rio de Janeiro city Its current Mayor is Alexandre Cardoso. The city is the third most populous in Rio de Janeiro Metropolitan Area.
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 (soccer) 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. Estádio De Los Larios, located in the district of Xerém, has a maximum capacity of 11,000 people and it is the home ground of Esporte Clube Tigres do Brasil.