Don Álvaro Navia-Osorio y Vigil, third Marquess of Santa Cruz de Marcenado, born in 1684 in Santa Maria de Vega in Asturia, Spain; killed in action near Oran in North Africa in 1732, was a Spanish diplomat, general, and author. At the time of his death in battle fighting off an attack by Ottoman forces in 1732 he was governor of the Spanish possession of Oran in North Africa.