Santiago de Liniers, 1st Count of Buenos Aires, French-Spanish captain and politician, 10th Viceroy of the Viceroyalty of the Río de la Plata (died 1810)

Santiago Antonio María de Liniers y Bremond, 1st Count of Buenos Aires, KOM, OM was a Spanish military officer and a viceroy of the Viceroyalty of the Río de la Plata. Although born Jacques de Liniers in France, he is more widely known by the Spanish form of his name.

The Viceroyalty of the Río de la Plata or Viceroyalty of Buenos Aires meaning "River of the Silver", also called the "Viceroyalty of River Plate" in some scholarly writings, in southern South America, was the last to be organized and also the shortest-lived of one of the viceroyalties of the Spanish Empire in the Americas. The name "Provincias del Río de la Plata" was formally adopted in 1810 during the Cortes of Cádiz to designate the Viceroyalty of the Río de la Plata.