List of highways numbered 171
Route 171, or Highway 171, may refer to:
Canada
- Prince Edward Island Route 171
- Quebec Route 171
Costa Rica
- National Route 171
Ireland
- R171 road
Israel
- Route 171
Japan
- Japan National Route 171
Korea, South
- Expressway 171
- * Osan–Hwaseong Expressway
- * Yongin–Seoul Expressway
United Kingdom
- road
United States
- U.S. Route 171
- Alabama State Route 171
- Arkansas Highway 171
- California State Route 171
- Connecticut Route 171
- Florida State Road 171
- Georgia State Route 171
- Illinois Route 171
- K-171
- Kentucky Route 171
- Maine State Route 171
- Maryland Route 171
- M-171
- Minnesota State Highway 171
- Missouri Route 171
- Nevada State Route 171
- New Hampshire Route 171
- New Jersey Route 171
- New Mexico State Road 171
- New York State Route 171
- North Carolina Highway 171
- Ohio State Route 171
- Oklahoma State Highway 171
- Pennsylvania Route 171
- South Carolina Highway 171
- Tennessee State Route 171
- Texas State Highway 171
- *Business State Highway 171-E
- * Texas State Highway Loop 171
- * Farm to Market Road 171
- Utah State Route 171
- Virginia State Route 171
- Washington State Route 171
- Wisconsin Highway 171
- Wyoming Highway 171