Cann is a village and civil parish in the county of Dorset in southern England. It is situated on the A350 road in the North Dorset administrative district, 1 mile (1.6 km) south of Shaftesbury. The civil parish covers 2,600 acres (1,100 ha) and has an underlying geology of Kimmeridge clay, greensand and gault clay. In the 2011 census the parish—which includes HM Prison Guys Marsh—had a population of 822.