List of highways numbered 173
The following highways are numbered 173:
Canada
- Prince Edward Island Route 173
- Quebec Route 173
India
- National Highway 173
Ireland
- R173 road
Japan
- Japan National Route 173
Korea, South
- Iksan–Pyeongtaek Expressway Branch
Philippines
- National Route 173
United Kingdom
- road
- B173 road
United States
- Alabama State Route 173
- Arizona State Route 173
- California State Route 173
- Connecticut Route 173
- Florida State Road 173
- Georgia State Route 173
- Illinois Route 173
- Iowa Highway 173
- K-173
- Kentucky Route 173
- Louisiana Highway 173
- Maine State Route 173
- Maryland Route 173
- M-173
- Missouri Route 173
- New Jersey Route 173
- New Mexico State Road 173
- New York State Route 173
- Ohio State Route 173
- Oregon Route 173
- Pennsylvania Route 173
- South Carolina Highway 173
- Tennessee State Route 173
- Texas State Highway 173
- * Texas State Highway Loop 173
- * Farm to Market Road 173
- Utah State Route 173
- Virginia State Route 173
- Washington State Route 173
- Wisconsin Highway 173
- Wyoming Highway 173