The Communauté de communes du Grand Roye is a communauté de communes in the Somme département and in the Hauts-de-France région of France. It was created on 1 January 2012, and the former Communauté de communes du canton de Montdidier was merged into it on 1 January 2017. It consists of 62 communes, and its seat is in Montdidier. Its area is 396.7 km2, and its population was 25,626 in 2018, of which 6,174 in Montdidier and 5,709 in Roye.