Highway 103 can refer to multiple roads:

• N103 (Belgium)

• New Brunswick Route 103
• Nova Scotia Provincial Highway 103
• Ontario Highway 103 (former)
• Prince Edward Island Route 103

• China National Highway 103

• National Route 103

• D103 road

• Bundesautobahn 103

• National Highway 103 (India)

• R103 road (Ireland)

• Japan National Route 103

• F103 highway (Nigeria)

• N103 highway (Philippines)

• R103 (South Africa)

• A103 road in north London.

• Alabama State Route 103
• Arkansas Highway 103
• California State Route 103
• Colorado State Highway 103
• Connecticut Route 103
• Florida State Road 103
  • County Road 103 (Duval County, Florida)
• Georgia State Route 103
• Illinois Route 103
• Indiana State Road 103
• Iowa Highway 103 (former)
• K-103 (Kansas highway)
• Kentucky Route 103
• Louisiana Highway 103
• Maine State Route 103
• Maryland Route 103
  • Maryland Route 103A
  • Maryland Route 103C
• Massachusetts Route 103
• M-103 (Michigan highway)
• Minnesota State Highway 103 (former)
  • County Road 103 (Hennepin County, Minnesota)
• Missouri Route 103
• Nebraska Highway 103
• New Hampshire Route 103
  • New Hampshire Route 103A
• County Route 103 (Ocean County, New Jersey)
• New Mexico State Road 103
• New York State Route 103
  • County Route 103 (Albany County, New York)
  • County Route 103 (Cayuga County, New York)
  • County Route 103 (Cortland County, New York)
  • County Route 103 (Dutchess County, New York)
  • County Route 103 (Fulton County, New York)
  • County Route 103 (Montgomery County, New York)
  • County Route 103 (Onondaga County, New York)
  • County Route 103 (Orleans County, New York)
  • County Route 103 (Rensselaer County, New York)
  • County Route 103 (Steuben County, New York)
  • County Route 103 (Suffolk County, New York)
  • County Route 103 (Sullivan County, New York)
  • County Route 103 (Tompkins County, New York)
    • County Route 103A (Tompkins County, New York)
    • County Route 103B (Tompkins County, New York)
  • County Route 103 (Wayne County, New York)
  • County Route 103 (Westchester County, New York)
• North Carolina Highway 103
• Ohio State Route 103
• Oklahoma State Highway 103 (former)
• Oregon Route 103
• Pennsylvania Route 103
• Rhode Island Route 103
  • Rhode Island Route 103A
• Tennessee State Route 103
• Texas State Highway 103
  • Texas State Highway Spur 103 (former)
  • Farm to Market Road 103
• Utah State Route 103
• Vermont Route 103
• Virginia State Route 103
  • Virginia State Route 103 (1928-1933) (former)
• Washington State Route 103
• West Virginia Route 103
• Wisconsin Highway 103

Territories

• Puerto Rico Highway 103

• A103
• P103