The following highways are numbered 347:

Australia

- Heathcote-Rochester Road

Canada

• Manitoba Provincial Road 347
• Nova Scotia Route 347
• Prince Edward Island Route 347
• Quebec Route 347

India

• National Highway 347

Japan

• Japan National Route 347

United States

• Arizona State Route 347
• Arkansas Highway 347
• Colorado State Highway 347
• County Road 347 (Levy County, Florida)
• Georgia State Route 347
• Maryland Route 347
• Mississippi Highway 347
• New Jersey Route 347
• New Mexico State Road 347
• New York:
  • New York State Route 347 (disambiguation)
  • County Route 347 (Erie County, New York)
• Ohio State Route 347
• Pennsylvania Route 347
• Puerto Rico Highway 347
• Tennessee State Route 347
• Texas State Highway 347
• Virginia State Route 347