Oyace is a small Italian comune in the autonomous region of Aosta Valley.
Oyace has 217 inhabitants (as at 31 December 2012) and lies at an altitude of 1177 m above sea level. M. in Valpelline. This is a side valley of the Valle del Gran San Bernardo. By Oyace of Le Buthier Valpelline flows.
During the Fascist period, the village was the Italianate name Oiasse.