List of highways numbered 138

Canada

• Ontario Highway 138
• Prince Edward Island Route 138
• Quebec Route 138

  Costa Rica

• National Route 138

  India

• National Highway 138

  Japan

• Japan National Route 138
• Fukuoka Prefectural Route 138
• Nara Prefectural Route 138

  Malaysia

• Malaysia Federal Route 138

  United States

• U.S. Route 138
• Alabama State Route 138
• Arkansas Highway 138
• California State Route 138
• Connecticut Route 138
• Florida State Road 138
• * County Road 138
• * County Road 138
• * County Road 138A
• * County Road 138
• Georgia State Route 138
• Hawaii Route 138
• Illinois Route 138
• K-138
• Kentucky Route 138
• Louisiana Highway 138
• Maine State Route 138
• Maryland Route 138
• Massachusetts Route 138
• M-138
• Missouri Route 138
• New Jersey Route 138
• New Mexico State Road 138
• New York State Route 138
• * County Route 138
• * County Route 138
• * County Route 138
• North Carolina Highway 138
• Ohio State Route 138
• Oregon Route 138
• Pennsylvania Route 138
• Rhode Island Route 138
• * Rhode Island Route 138A
• Tennessee State Route 138
• Texas State Highway 138
• * Texas State Highway Spur 138
• * Farm to Market Road 138
• Utah State Route 138
• * Utah State Route 138
• Virginia State Route 138
• * Virginia State Route 138
• Wisconsin Highway 138
• Wyoming Highway 138

• Puerto Rico Highway 138