Johannes Ockeghem (c. 1410 – 6 February 1497) was a Franco-Flemish composer and singer of early Renaissance music. Ockeghem was the most influential European composer in the period between Guillaume Du Fay and Josquin des Prez, and he was—with his colleague Antoine Busnois—the leading European composer in the second half of the 15th century. He was an important proponent of the early Franco-Flemish School.

Ockeghem was well associated with other leading composers of the time, and spent most of his career serving the French royal court under Charles VII, Louis XI and Charles VIII. Numerous poets and musicians lamented his death, including Erasmus, Guillaume Crétin, Jean Molinet and Josquin, who composed the well known Nymphes des bois for him.

It is thought that Ockeghem's extant works represent only a small part of his entire oeuvre, including around 14 masses, 20 chansons and fewer than 10 motets—though the exact numbers vary due to attribution uncertainties. His better-known works include the canon-based Missa prolationum; the Missa cuiusvis toni, which can be sung in any mode; the chanson Fors seulement; and the earliest surviving polyphonic Requiem.