Oregon Route 34 is a state highway in the U.S. state of Oregon that runs between the city of Waldport on the Oregon Coast and the city of Lebanon in the western part of the state. West of Philomath, the highway is known as the Alsea Highway No. 27 (see Oregon highways and routes). Between Philomath and Corvallis, it is part of the Corvallis-Newport Highway No. 33. In Corvallis, OR 34 includes a brief concurrency with U.S. Route 20 and OR 99W over the Pacific Highway West No. 1W.