List of highways numbered 343

Australia

Canada

• Manitoba Provincial Road 343
• Newfoundland and Labrador Route 343
• Prince Edward Island Route 343
• Quebec Route 343
• Saskatchewan Highway 343

  Japan

• Japan National Route 343

  Nigeria

• A343 highway

  United States

• Connecticut Route 343
• County Road 343
• Georgia State Route 343
• Louisiana Highway 343
• Maryland Route 343
• M-343
• New York:
• * New York State Route 343
• * County Route 343
• North Carolina Highway 343
• Ohio State Route 343
• Pennsylvania Route 343
• Puerto Rico Highway 343
• Tennessee State Route 343
• Texas:
• * Texas State Highway 343
• * Texas State Highway Loop 343
• Virginia State Route 343
• Wyoming Highway 343