Marbrianus de Orto (Dujardin; also Marbriano, Marbrianus) (c. 1460 – January or February 1529) was a Netherlandish composer of the Renaissance (Franco-Flemish school). He was a contemporary, close associate, and possible friend of Josquin des Prez, and was one of the first composers to write a completely canonic setting of the Ordinary of the Mass.