Sancho de Tovar e Silva, "jure uxoris" Lord of the Honour of Molelos (1551 – April 13, 1629) was a Portuguese nobleman and military man most notable for having been among the few companions of King Sebastian of Portugal who survived the disastrous Battle of Alcácer Quibir. He was later governor of Diu on behalf of Philip III of Portugal and held the rank of "Almirante-mór" (Chief Admiral) in the Portuguese Navy.