Gymnopilus oregonensis is a species of mushroom in the family Hymenogastraceae.
The cap of Gymnopilus oregonensis is in diameter. It can be convex or round, and is brownish in color. The stipe is long and 2-7 millimetres wide. The gills start out yellowish, before becoming brownish in age. The spore print is orangish brown.
Gymnopilus oregonensis has been found growing on conifer logs in Oregon, in November. It fruits in late summer and autumn.