List of highways numbered 100

Route 100, or Highway 100, may refer to:

Australia

• Great Ocean Road
• Lincoln Highway (Australia)
• Flinders Highway, South Australia

Canada

• Alberta Highway 100
• Manitoba Highway 100
• New Brunswick Route 100
• former Highway 100 (Ontario)

Germany

• Bundesautobahn 100, the Berliner Stadtring (Berlin City Ring Road)
• Bundesstraße 100

Korea, South

• Seoul Ring Expressway

Malaysia

• A100 road (Malaysia), a road in Perak

Netherlands

• Stadsroute 100 (Amsterdam), the city center ring road

Turkey

• , a west-east state road running from the Bulgarian border to Iranian border.

United Kingdom

• A100 road, part of the London Inner Ring Road

United States

• Alabama State Route 100
• Arkansas Highway 100
• California State Route 100
• Colorado State Highway 100
• Connecticut Route 100
• Delaware Route 100
• Florida State Road 100
• Georgia State Route 100
• Illinois Route 100
• Iowa Highway 100
• Kansas Highway 100 (former)
• Louisiana Highway 100
• Maine State Route 100
• Maryland Route 100
• M-100 (Michigan highway)
• Minnesota State Highway 100
• Missouri Route 100
• New Jersey Route 100 (former)
• New York State Route 100
• North Carolina Highway 100
• Ohio State Route 100
• Oklahoma State Highway 100
• Pennsylvania Route 100
• Rhode Island Route 100
• South Dakota Highway 100 (former)
• Tennessee State Route 100
• Texas State Highway 100
  • Texas State Highway Spur 100
  • Farm to Market Road 100 (Texas)
  • Texas Park Road 100
• Utah State Route 100
• Vermont Route 100
  • Vermont Route 100A
  • Vermont Route 100B
  • Vermont Route 100C
• Virginia State Route 100
• Washington State Route 100
• West Virginia Route 100
• Wisconsin Highway 100