The following highways are numbered 308:
Brazil BR-308
Canada Manitoba Provincial Road 308 Nova Scotia Route 308 Prince Edward Island Route 308 Saskatchewan Highway 308
China China National Highway 308
Costa Rica National Route 308
Japan Japan National Route 308
United Kingdom A308 road
United States
Arkansas Highway 308 Florida State Road 308 (former) County Road 308 (Putnam County, Florida) County Road 308B (Putnam County, Florida) Georgia State Route 308 Kentucky Route 308 Louisiana Highway 308 Maryland Route 308 (unsigned) Minnesota State Highway 308 Montana Secondary Highway 308 New York State Route 308 County Route 308 (Albany County, New York) County Route 308 (Erie County, New York) County Route 308 (Wayne County, New York) North Carolina Highway 308 Ohio State Route 308 Pennsylvania Route 308 South Carolina Highway 308 Tennessee State Route 308 Texas State Highway 308 Texas State Highway Loop 308 Farm to Market Road 308 Utah State Route 308 (former) Virginia State Route 308 Washington State Route 308
Puerto Rico Highway 308 U.S. Virgin Islands Highway 308