Benedictus Aretius (surname derived from Marti by Greek translation) (1505–1574) was a Swiss Protestant theologian, Protestant reformer and natural philosopher.
He was born at Bätterkinden, in the canton of Bern, Switzerland.
He studied at Strasbourg and at Marburg, where he became professor of logic.
His major work, Theologiæ problemata (Bern, 1573), was a compendium of the knowledge of the time and was highly valued.
His Examen theologicum (1557) ran through six editions in fourteen years.