Grand Calais Terres et Mers (; before 2017: Communauté d'agglomération du Calaisis) is an agglomeration community created on 28 December 2000 and located in the Pas-de-Calais département, in northern France. It was expanded with four communes from the Communauté de communes des Pays d'Opale on 1 December 2019. Its area is 184.1 km<sup>2</sup>. Its population was 104,367 in 2018, of which 72,929 in Calais proper.
It comprises the following 14 communes: