Belford Roxo () is a city in the state of Rio de Janeiro, Brazil. It is a part of the metropolitan region of the city of Rio de Janeiro and was created in 1990. Its population was 513,118 in 2020 and its area is 79 km². Belford Roxo is not one of the richest and wealthiest cities in the state, due to its low GDP and relatively high population. Its climate is tropical with an average temperature of 18 °C (63 °F). Bayer and Lubrizol are the biggest companies in the municipality. It was named after Engineer Raimundo Teixeira Belfort Roxo. While serving as General Construction and Building Inspector for the city of Rio de Janeiro, Engineer Belfort Roxo, together with Engineer Paulo de Frontin, solved the water shortage problems of the area during the summer of 1889.