List of highways numbered 172

Canada

• New Brunswick Route 172
• Prince Edward Island Route 172
• Quebec Route 172

  Ireland

• R172 road

  Japan

• Japan National Route 172

  United States

• Interstate 172
• Interstate 172
• Alabama State Route 172
• Arizona State Route 172
• California State Route 172
• Colorado State Highway 172
• Connecticut Route 172
• Georgia State Route 172
• Illinois Route 172
• Kentucky Route 172
• Louisiana Highway 172
• Maine State Route 172
• Maryland Route 172
• M-172
• Minnesota State Highway 172
• Mississippi Highway 172
• Missouri Route 172
• Nevada State Route 172
• New Jersey Route 172
• New Mexico State Road 172
• New York State Route 172
• North Carolina Highway 172
• Ohio State Route 172
• Pennsylvania Route 172
• South Carolina Highway 172
• Tennessee State Route 172
• Texas State Highway 172
• * Texas State Highway Loop 172
• * Texas State Highway Spur 172
• * Farm to Market Road 172
• Utah State Route 172
• Virginia State Route 172
• Washington State Route 172
• Wisconsin Highway 172
• Wyoming Highway 172

• Puerto Rico Highway 172