List of highways numbered 100

Australia

• Great Ocean Road, Victoria
• Surf Coast Highway, Victoria
• Flinders Highway, South Australia
• Lincoln Highway, South Australia

Canada

• Alberta Highway 100 (Sherwood Park Freeway)
• Manitoba Highway 100 (Perimeter Highway)
• New Brunswick [Route 100]
• Newfoundland and Labrador Route 100
• Niagara Regional Road 100, Ontario
• former Highway 100 (Ontario)

Costa Rica

• National Route 100

Croatia

• D100 road

Germany

• Bundesautobahn 100, the Berliner Stadtring
• Bundesstraße 100

India

• National Highway 100

Korea, South

• Seoul Ring Expressway

Malaysia

• Jalan Gula, Perak State Route A100, a road in Perak
• Federal Route 100, a highway bypass in Manjung district, Perak

Mexico

• Sonora State Highway 100

Netherlands

• Stadsroute 100, the city center ring road

Nigeria

• F100 highway (Nigeria)

Philippines

• N100 highway (Philippines)

Poland

• Voivodeship road 100 (Poland) in the Pomeranian Voivodeship

Serbia

• State Road 100 (Serbia), an IIA-class road connecting Horgoš with Batajnica.

Turkey

• State road D.100 (Turkey), a west–east state road running from the Bulgarian border to Iranian border.

United Kingdom

• road, part of the London Inner Ring Road
• B100 road

United States

• U.S. Route 100
• Alabama [State Route 100]
• * County 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
• Indiana State Road 100
• Iowa Highway 100
• K-100 (Kansas highway)
• Kentucky Route 100
• Louisiana Highway 100
• Maine State Route 100
• Maryland Route 100
• * Maryland Route 100 (1930s-1950s)
• * Maryland Route 100 (former)
• * Maryland Route 100J
• * Maryland Route 100L
• * Maryland Route 100M
• * Maryland Route 100N
• * Maryland Route 100O
• * Maryland Route 100P
• * Maryland Route 100Q
• * Maryland Route 100R
• * Maryland Route 100S
• * Maryland Route 100T
• * Maryland Route 100U
• * Maryland Route 100V
• * Maryland Route 100W
• * Maryland Route 100X
• M-100 (Michigan highway)
• Minnesota State Highway 100
• Missouri Route 100
• Nebraska Highway 100
• New Jersey Route 100
• * County Route 100 (Bergen County, New Jersey)
• New York State Route 100
• * County Route 100 (Cortland County, New York)
• * County Route 100 (Dutchess County, New York)
• * County Route 100 (Rockland County, New York)
• * County Route 100 (Suffolk County, New York)
• * County Route 100 (Wayne County, New York)
• North Carolina Highway 100
• Ohio State Route 100
• Oklahoma State Highway 100
• Pennsylvania Route 100
• Rhode Island Route 100
• South Dakota Highway 100
• Tennessee State Route 100
• Texas State Highway 100
• * Texas State Highway Spur 100
• * Farm to Market Road 100
• * Texas Park Road 100
• Utah State Route 100
• Vermont Route 100
• Virginia State Route 100
• Washington State Route 100
• West Virginia Route 100
• Wisconsin Highway 100

• Puerto Rico Highway 100