List of highways numbered 345

Canada

• Manitoba Provincial Road 345
• New Brunswick Route 345
• Newfoundland and Labrador Route 345
• Prince Edward Island Route 345
• Quebec Route 345

  Japan

• Japan National Route 345

  United States

• Interstate 345
• Arkansas Highway 345
• Florida:
• * Florida State Road 345
• * County Road 345
• New York State Route 345
• North Carolina Highway 345
• Ohio State Route 345
• Pennsylvania Route 345
• Puerto Rico Highway 345
• Texas:
• * Texas State Highway 345
• * Texas State Highway Loop 345
• Virginia State Route 345
• * Virginia State Route 345
• Wyoming Highway 345