List of highways numbered 12

• Asian Highway 12
• E12 European route E12
• E012 European route E012

• National Route 12 (Argentina)

• Western Sydney Airport Motorway (proposed)
• Mallee Highway
• South Gippsland Highway

• Inntal Autobahn

• Републикански път I-12

• Alberta Highway 12
• British Columbia Highway 12
• Manitoba Highway 12
• Nova Scotia Trunk 12
• Ontario Highway 12
• Prince Edward Island Route 12
• Quebec Route 12 (former)
• Saskatchewan Highway 12

• G12 Expressway

• I/12 Highway; Czech: Silnice I/12

12

National Highway 12 (India)

• Road 12

• Highway 12 (Iraq)

• Highway 12 (Israel)

• Japan National Route 12

• Expressway 12
  • Muan–Gwangju Expressway
  • Gwangju–Daegu Expressway

• Tun Razak Highway

• New Zealand State Highway 12

• National Route 12

• DN12 - Drumul Național 12
• A12 - Pitești–Craiova Expressway

• N12 road (South Africa)

• Provincial Highway 12 (Taiwan)

• British A12 (London-Great Yarmouth)

• Interstate 12
• U.S. Route 12
• New England Interstate Route 12 (former)
• Alabama State Route 12 (former)
• Arkansas Highway 12
• California State Route 12
  • County Route A12 (California)
  • County Route E12 (California)
  • County Route G12 (California)
  • County Route J12 (California)
  • County Route S12 (California)
• Colorado State Highway 12
• Connecticut Route 12
• Delaware Route 12
• Florida State Road 12
  • County Road 12 (Gadsden County, Florida)
  • County Road 12 (Leon County, Florida)
• Georgia State Route 12
• Illinois Route 12 (former)
• Iowa Highway 12
  • County Route C12 (Humboldt County, Iowa)
• K-12 (Kansas highway) (former)
• Kentucky Route 12
• Louisiana Highway 12
  • Louisiana State Route 12 (former)
• Maryland Route 12
• Massachusetts Route 12
• M-12 (Michigan highway) (former)
• Mississippi Highway 12
• Missouri Route 12
• Nebraska Highway 12
• Nevada State Route 12 (former)
• New Hampshire Route 12
• New Jersey Route 12
  • County Route 12 (Monmouth County, New Jersey)
• New Mexico State Road 12
• New York State Route 12
  • County Route 12 (Allegany County, New York)
  • County Route 12 (Cattaraugus County, New York)
  • County Route 12 (Chemung County, New York)
  • County Route 12 (Chenango County, New York)
  • County Route 12 (Clinton County, New York)
  • County Route 12 (Genesee County, New York)
  • County Route 12 (Greene County, New York)
  • County Route 12 (Jefferson County, New York)
  • County Route 12 (Nassau County, New York)
  • County Route 12 (Niagara County, New York)
  • County Route 12 (Onondaga County, New York)
  • County Route 12 (Otsego County, New York)
  • County Route 12 (Putnam County, New York)
  • County Route 12 (Schuyler County, New York)
  • County Route 12 (St. Lawrence County, New York)
  • County Route 12 (Steuben County, New York)
  • County Route 12 (Suffolk County, New York)
  • County Route 12 (Ulster County, New York)
  • County Route 12 (Warren County, New York)
• North Carolina Highway 12
• Ohio State Route 12
• Pennsylvania Route 12
• Rhode Island Route 12
• South Carolina Highway 12
• South Dakota Highway 12 (former)
• Tennessee State Route 12
• Texas State Highway 12
  • Texas State Highway Loop 12
  • Ranch to Market Road 12
  • Texas Park Road 12
• Utah State Route 12
• Vermont Route 12
• State Route 12 (Virginia 1918-1933) (former)
  • State Route 12 (Virginia 1933-1935) (former)
  • State Route 12 (Virginia 1935-1953) (former)
• State Road 12 (Washington 1905–1919) (former)
  • Washington State Route 12 (1964-1967) (former)
  • Primary State Highway 12 (Washington) (former)
  • Secondary State Highway 12G (Washington) (former)
  • Secondary State Highway 12H (Washington) (former)
• West Virginia Route 12
• Wisconsin Highway 12 (former)
• Wyoming Highway 12

Territories

• Guam Highway 12
• Puerto Rico Highway 12

• List of A12 roads
• List of highways numbered 12A
• List of highways numbered 12B
• List of highways numbered 12C
• List of highways numbered 12D
• List of highways numbered 12E
• List of highways numbered 12F