Count of Penaguião (in Portuguese Conde de Penaguião) is a Portuguese title of nobility, created by King Philip I of Portugal, on 10 February 1583, for Dom João Rodrigues de Sá.

The noble family of Sá were elevated as Marquises of Fontes in 1659.

By Royal Decree of King John V of Portugal on 24 June 1718, the 3rd Marquis of Fontes, a celebrated military commander and ambassador, received a grant of land from the Crown and was conferred the additional distinguished marquisate of Abrantes; the Letters Patent also granted him the additional ancient arms and name of Almeida and stipulated the countship of Penaguião devolve upon the Marquis' heir apparent de jure.