State Route 103 (SR 103) is a 19.97-mile-long (32.14 km) state highway serving the Long Beach Peninsula, located within Pacific County in the U.S. state of Washington. The highway travels north from U.S. Route 101 (US 101) in Seaview through Long Beach and Ocean Park to the southern entrance of Leadbetter Point State Park. SR 103 was created in the 1964 highway renumbering, replacing the earlier Secondary State Highway 12A (SSH 12A) that was created in 1937 to serve Long Beach and Ocean Park, later extended north in 1991 to serve Leadbetter Point State Park.

U.S. Route 101 (US 101) is a United States Numbered Highway that runs along the West Coast from Los Angeles, California to Tumwater, Washington. Within the state of Washington, US 101 connects cities on the coast of the Pacific Ocean and encircles the Olympic Peninsula around the Olympic Mountains. It also serves as the main access for Olympic National Park, several state parks, and other scenic and recreational areas.