Cornelius Pass Road is an arterial road over Cornelius Pass in the Tualatin Mountains west of Portland, Oregon, United States. Running north–south, the road stretches between U.S. Route 30 on the north and Oregon Route 8 on the south. The road passes through Washington and Multnomah counties, crossing the Tualatin Mountains at Cornelius Pass at the 577-foot (176 m) elevation.