Communauté d'agglomération Grand Belfort is an intercommunal structure, centred on the city of Belfort. It is located in the Territoire de Belfort department, in the Bourgogne-Franche-Comté region, eastern France. It was created in January 2017. Its seat is in Belfort. Its area is 262.0 km<sup>2</sup>. Its population was 103,741 in 2017, of which 47,656 in Belfort proper.
The communauté d'agglomération consists of the following 52 communes: