List of highways numbered 312

Canada

• Manitoba Provincial Road 312
• Nova Scotia Route 312
• Prince Edward Island Route 312
• Saskatchewan Highway 312

  China

• China National Highway 312

  Costa Rica

• National Route 312

  Japan

• Japan National Route 312

  United States

• U.S. Route 312
• Arkansas Highway 312
• Florida State Road 312
• Georgia State Route 312
• Indiana State Road 312
• Kentucky Route 312
• Louisiana Highway 312
• Maryland Route 312
• Minnesota State Highway 312
• New Mexico State Road 312
• New York:
• * New York State Route 312
• * New York State Route 312
• * County Route 312
• * County Route 312
• Ohio State Route 312
• Pennsylvania Route 312
• Puerto Rico Highway 312
• Tennessee State Route 312
• Texas:
• * Texas State Highway 312
• * Texas State Highway Spur 312
• Farm to Market Road 312
• Utah State Route 312
• Virginia State Route 312
• Wisconsin Highway 312
• Wyoming Highway 312