List of highways numbered 403

Canada

• Manitoba Provincial Road 403
• Newfoundland and Labrador Route 403
• Highway 403

  Costa Rica

• National Route 403

  Croatia

• D403 road

  Hungary

• Main road 403

  Japan

• Japan National Route 403

  Thailand

• Thailand Route 403

  United States

• Georgia State Route 403
• Indiana State Road 403
• New York:
• * New York State Route 403
• * County Route 403
• * County Route 403
• North Carolina Highway 403
• Pennsylvania Route 403
• Puerto Rico Highway 403
• Rhode Island Route 403
• South Carolina Highway 403
• Virginia State Route 403
• Washington State Route 403