List of highways numbered 188

• Alabama State Route 188
• Arizona State Route 188
• California State Route 188
• Connecticut Route 188
• Farm to Market Road 188
• Florida State Road 188
• Georgia State Route 188
• Iowa Highway 188
• Japan National Route 188
• K-188 (Kansas highway)
• Kentucky Route 188
• M-188 (Michigan highway)
• Maine State Route 188
• Maryland Route 188
• New Mexico State Road 188
• New York State Route 188 (disambiguation)
• Ohio State Route 188
• Pennsylvania Route 188
• Puerto Rico Highway 188
• South Carolina Highway 188
• State Highway 188 (Andhra Pradesh)
• Tennessee State Route 188
• Texas State Highway 188
• Texas State Highway Spur 188
• Urban Road 188
• Utah State Route 188
• Virginia State Route 188
• Wisconsin Highway 188