List of highways numbered 174

• Ottawa Regional Road 174
• Prince Edward Island Route 174

• National Route 174

• Route 174 (Japan) (Japan's shortest national highway)

• Interstate 174 (proposed)
• Alabama State Route 174
• California State Route 174
• Connecticut Route 174
• Georgia State Route 174
• Illinois Route 174 (former)
• Kentucky Route 174
• Louisiana Highway 174
• Maine State Route 174
• Maryland Route 174
• M-174 (Michigan highway)
• Missouri Route 174
• New Jersey Route 174 (former)
• New Mexico State Road 174
• New York State Route 174
  • New York State Route 174X
• Ohio State Route 174
• Pennsylvania Route 174
• South Carolina Highway 174
• Tennessee State Route 174
• Texas State Highway 174
  • Texas State Highway Spur 174
  • Farm to Market Road 174
• Utah State Route 174
• Virginia State Route 174
• Washington State Route 174
• Wisconsin Highway 174 (former)
• Wyoming Highway 174

Territories:

• Puerto Rico Highway 174