Manuel Cardoso was a Portuguese composer and organist. Along with Duarte Lobo and John IV of Portugal, he represented the "golden age" of Portuguese polyphony.

Cardoso was born in Fronteira, near Portalegre, most likely in 1566. He attended the Colégio dos Moços do Coro, a choir school associated with the Évora cathedral, studying with Manuel Mendes and Cosme Delgado. In 1588 he joined the Carmelite order, taking his vows in 1589. In the early 1620s he was resident at the ducal household of Vila Viçosa, where he was befriended by the Duke of Barcelos—later to become King John IV. For most of his career he was resident composer and organist at the Convento do Carmo. He died in Lisbon.

Cardoso’s works are models of Palestrinian polyphony, and are written in a refined, precise style which completely ignores the development of the Baroque idiom elsewhere in Europe. His style has much in common with Victoria, in its careful treatment of dissonance, occasional polychoral writing, and frequent cross-relations, which were curiously common among both Iberian and English composers of the time. Three books of masses survive; many of the works are based on motets written by King John IV himself, and others are based on motets by Palestrina. Cardoso was widely published, often with the help of King John IV to defray costs. Many of his works—especially the elaborate polychoral compositions, which probably were the most progressive—were destroyed in the Lisbon earthquake and fire of 1755.