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 (Israel)
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 (former) Connecticut Route 171 Florida State Road 171 (former) Georgia State Route 171 Illinois Route 171 K-171 (Kansas highway) Kentucky Route 171 Maine State Route 171 Maryland Route 171 M-171 (Michigan highway) 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) 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 Territories Puerto Rico Highway 171