The Communauté d'agglomération de la Baie de Somme is a communauté d'agglomération in the Somme département and in the Hauts-de-France région of France. It was formed on 1 January 2017 by the merger of the former Communauté de communes de l’Abbevillois, the Communauté de communes de la Région d'Hallencourt and the Communauté de communes Baie de Somme Sud. Its area is 398.6 km. Its population was 48,903 in 2018, of which 22,837 in Abbeville.

This Communauté d'agglomération comprises 43 communes:

50°06′N 1°50′E / 50.10°N 1.83°E / 50.10; 1.83