Jean Leleu, most commonly known by the latinized version of his name, Johannes Lupi (c. 1506 – December 20, 1539), was a Franco-Flemish composer of the Renaissance.
In 1527 he became master of the choirboys at the Cambrai Cathedral, a position which typically included housing and boarding them in addition to teaching them music.
Lupi had an unnamed chronic illness which plagued him increasingly in the 1530s—he had to leave his position because of it in 1535—and which caused his early death.
One noteworthy work is his setting of Ergone conticuit, the lament on the death of Johannes Ockeghem written by Erasmus.
Stylistically his music was related to that of Nicolas Gombert, and showed the typical tendencies of the generation after Josquin with its densely textured polyphony and rich imitation, but Lupi remained extraordinarily sensitive to text-setting, being able to present clearly understandable words even in eight-part counterpoint.