The Mérode Altarpiece is an oil on oak panel triptych, now in The Cloisters, in New York City. It is unsigned and undated, but attributed to Early Netherlandish painter Robert Campin and an assistant. The three panels represent, from left to right, the donors kneeling in prayer in a garden, the moment of the Annunciation to Mary, which is set in a contemporary, domestic setting, and Saint Joseph, a carpenter with the tools of his trade. The many elements of religious symbolism include the lily and fountain, and the Holy Spirit represented by the rays of light coming through from the central panel's left hand window.

A triptych is a work of art that is divided into three sections, or three carved panels that are hinged together and can be folded shut or displayed open. It is therefore a type of polyptych, the term for all multi-panel works. The middle panel is typically the largest and it is flanked by two smaller related works, although there are triptychs of equal-sized panels. The form can also be used for pendant jewelry.