The following highways are numbered 366:

• Manitoba Provincial Road 366
• Nova Scotia Route 366
• Quebec Route 366

• National Highway 366 (India)

• Route 366 (Japan)

• FT 366 Federal Route 366

• U.S. Route 366
  • U.S. Route 366 (1926)
  • U.S. Route 366 (1932–1939)
• Arizona State Route 366
• Florida State Road 366
• Georgia State Route 366 (former)
• Hawaii Route 366
• Louisiana Highway 366
• Maryland Route 366
• Mississippi Highway 366
• Missouri Route 366
• New York State Route 366
• Ohio State Route 366
• Pennsylvania Route 366
• Texas State Highway Spur 366
• Virginia State Route 366

Territories

• Puerto Rico Highway 366