Route 518, or Highway 518, may refer to:

Canada[edit]

• Manitoba Provincial Road 518
• Ontario Highway 518

United Kingdom[edit]

• A518 road

United States[edit]

• 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