List of highways numbered 138

Highway 138 may refer to:

Canada

• Ontario Highway 138
• Quebec Route 138

United States

• U.S. Route 138
• Alabama State Route 138 (former)
• California State Route 138
• Connecticut Route 138
• Georgia State Route 138
  • Georgia State Route 138 Spur
• Illinois Route 138
• K-138 (Kansas highway)
• Kentucky Route 138
• Louisiana Highway 138
• Maine State Route 138
• Maryland Route 138
• Massachusetts Route 138
• M-138 (Michigan highway)
• Missouri Route 138
• New Jersey Route 138
• New Mexico State Road 138
• New York State 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
• Utah State Route 138
• Virginia State Route 138
• Wisconsin Highway 138
• Wyoming Highway 138