Antonio Olaguer Feliú y Heredia López y Domec (1742–1813) was a Spanish soldier and politician who spent most of his career in South America.

Born in Villafranca del Bierzo, León, Olaguer Feliú was sent to Buenos Aires as a military specialist during the governorship of Pedro de Cevallos.

Then don Antonio Olaguer Feliú was named Viceroy of the Río de la Plata, a position he occupied between May 2, 1797, and May 14, 1799.

During his mandate, he had to contend with the presence of British and Portuguese forces in the Río de la Plata region, as well as nascent revolutionary sentiment inspired by the recent French Revolution.

He opened the port of Buenos Aires to foreign traffic in a bid to stimulate the commercial activities of the Viceroyalty, which had begun to suffer from the growing tensions between the European powers.