The white-shouldered triller (Lalage sueurii) is a passerine bird belonging to the triller genus Lalage in the cuckoo-shrike family Campephagidae. It is found in Indonesia and East Timor. The white-winged triller (L. tricolor) of Australia and New Guinea was formerly included in this species but is now treated as a separate species. The pied triller is similar but is slightly smaller with a broader stripe above the eye and more white in the wing. The male white-winged triller has no white stripe over the eye.