The following highways are numbered 348:

Australia

Canada

• Manitoba Provincial Road 348
• Nova Scotia Route 348
• Prince Edward Island Route 348
• Quebec Route 348

India

• National Highway 348 (India)

Japan

• Japan National Route 348

United States

• Arkansas Highway 348
• Colorado State Highway 348
• Georgia State Route 348
• Kentucky Route 348
• Louisiana Highway 348
• Maryland Route 348
• New York:
  • New York State Route 348 (former)
  • County Route 348 (Erie County, New York)
• Ohio State Route 348
• Pennsylvania Route 348
• Puerto Rico Highway 348
• Tennessee State Route 348
• Texas:
  • Texas State Highway 348 (former)
  • Texas State Highway Spur 348
• Virginia State Route 348