Francisco Xavier da Silva Pereira, 1st Count of Antas (14 March 1793 – 20 May 1852) was a Portuguese nobleman and a leading soldier of the period of the Liberal Wars.

He took part in the Chartist rebellion against Miguel at Porto in May 1828, and subsequently escaped to England to place himself under the authority of Dom Pedro, the ex-Emperor of Brazil, who was organizing resistance on behalf of his daughter, the legitimate Queen Maria II.

In August, Silva Pereira sailed to Madeira as part of a contingent sent to strengthen the forces of the governor, José Travassos Valdez, who was holding out for the Queen, but Madeira was almost immediately captured by Miguel's forces and Silva Pereira joined Travassos Valdez in the evacuation of the Queen's supporters to England.

He then served in Dom Pedro's forces in the recapture of the Azores and the Portuguese Civil War of 1832–34 in which the Miguelites were defeated.

In 1836 he was the General in command of the Portuguese Expeditionary Force that was sent to aid the Queen of Spain during the Carlist Wars.