The following highways are numbered 266:

Canada[edit]

• Manitoba Provincial Road 266
• Prince Edward Island Route 266

Japan[edit]

• Japan National Route 266

United States[edit]

• Interstate 266 (unbuilt)
• U.S. Route 266
• Arizona State Route 266
• Arkansas Highway 266
• California State Route 266
• Colorado State Highway 266
• Georgia State Route 266
• Indiana State Road 266
• Iowa Highway 266 (former)
• K-266 (Kansas highway)
• Kentucky Route 266
• Minnesota State Highway 266 (former)
• Missouri Route 266
• Nevada State Route 266
• New Mexico State Road 266
• New York State Route 266
• Ohio State Route 266
• Oklahoma State Highway 266
• Pennsylvania Route 266 (former)
• South Carolina Highway 266
• Tennessee State Route 266
• Texas State Highway 266 (former)
  • Texas State Highway Loop 266
  • Farm to Market Road 266 (Texas)
• Utah State Route 266