Louisiana Highway 108 (LA 108) is a state highway located in western Calcasieu Parish, Louisiana that runs 24.8 miles (39.9 km) in a general west–east direction from Interstate 10 (I-10) in Vinton to U.S. Highway 90 (US 90) in Sulphur. The highway runs in roughly a "U" shape along section line roads, dipping southward from Vinton then east parallel to I-10 and back to the north toward Sulphur. The majority of the route is signed west–east except for the eastern leg running north to Sulphur, which is signed north–south. The latter section is also the most travelled, providing access to the oil and petrochemical industry south of Sulphur and a connection to LA 27.