Tapia de Casariego is a municipality in the Autonomous Community of the Principality of Asturias, Spain. It is bordered on the north by the Cantabrian Sea, on the east by El Franco, on the south and west by Castropol. Tapia is also the name of one of the parishes inside the municipality. Its capital is Tapia. The capital, is 127 km from Oviedo, from Gijón 122 km, 97 km from Lugo, from these cities can reach the council via road N-634, the freeway A-8 (E70), and Ranon the airport in site 86 km from the town, another railroad access is by the railway line FEVE Ferrol - Gijón with stops in La Roda.

The terrain is gentle enough altitudes into the interior of the municipality are the most noteworthy pointing the Grandela (348 m) and the hill of Posadoiro (600 m). The Council has diverse beaches among which are found, the Penarronda (shared with the council in Castropol), Santa Gadea, Serantes, Los Campos, Porcía (Shared with the council of El Franco).

The council was established in 1863 when several parishes of the councils of Castropol and El Franco separated. The main driving force behind the creation of the new council was Fernando Fernández de Casariego, Marquis de Casariego. In recognition and appreciation, the Tapia council completed its name as 'Tapia de Casariego'.

In the 10th century the king Ramiro II, donate to the Bishop of Oviedo the territory between the Eo river and Navia and that is including the current council Tapia de Casariego. This grant is ratified by King Alfonso VII in the 12th century, which confirms that the territory Oviedo is the Obispalia in strong conflict with that of Lugo Salave retaining possessions and Villamil.