Platydyptes is a genus of extinct penguins from the Late Oligocene to Early Miocene (about 27.3 to 21.7 million years ago) of New Zealand. It was created by Brian Marples in 1952 and contains three relatively large species, all of which were described from the north Otago to south Canterbury region in the South Island. The genus name Platydyptes combines the Greek platys ("broad and flat"), alluding to the shape of the humerus, with dyptes ("diver").