Alió is a municipality in the comarca of Alt Camp, in the province of Tarragona, Catalonia, Spain. It is one of the smaller settlements within Alt Camp, a comarca located in the inland part of the province, north of the city of Tarragona.
As a municipality, Alió forms its own local administrative unit within the Catalan system of comarques and municipalities. Its territory lies in the Alt Camp district, a region of Catalonia whose principal town is Valls.