Pedro de Acuña y Meneses, Marqués de Assentar (1607 to 1674), also known as Pedro da Cunha, was a Portuguese-born nobleman and soldier who served in the Spanish army during the 17th century. Appointed commander of the Army of Flanders in 1673, he was killed on 11 August 1674 at the Battle of Seneffe, then in the Spanish Netherlands.