Route 518, or Highway 518, may refer to:
Canada Manitoba Provincial Road 518 Ontario Highway 518
United Kingdom A518 road
United States Florida State Road 518 County Road 518 (Pasco County, Florida) Louisiana Highway 518 Maryland Route 518 Montana Secondary Highway 518 Nevada State Route 518 County Route 518 (New Jersey) New Mexico State Road 518 Ohio State Route 518 Pennsylvania Route 518 South Carolina Highway 518 (former) Farm to Market Road 518, Texas Texas State Highway Loop 518 Virginia State Route 518 (1928) Washington State Route 518 Territories Puerto Rico Highway 518