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.

The neighboring municipalities are Bionaz, Nus, Ollomont, Quart and Valpelline.

During the Fascist period, the village was the Italianate name Oiasse.