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Several highways are numbered 100:
Manitoba Highway 100 (Perimeter Highway)
* 
Niagara Regional Road 100, Ontario
* 
former
National Route 100
Bundesautobahn 100, the ''Berliner Stadtring'' (Berlin City Ring Road)
*
Bundesstraße 100
Seoul Ring Expressway
Federal Route 100 (Lumut Bypass), a highway bypass in Manjung district, Perak
Sonora State Highway 100
Stadsroute 100 (Amsterdam), the city center ring road
N100 highway (Philippines)
Voivodeship road 100 (Poland) in the Pomeranian Voivodeship
State Road 100 (Serbia), an IIA-class road connecting Horgoš with Batajnica.
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
* 
Indiana State Road 100 (former)
* 
Iowa Highway 100
* 
K-100 (Kansas highway) (former)
* 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 (former)
* 
New Jersey Route 100 (former)
** 
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 (proposed)
* 
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
;Territories:
* 
Puerto Rico Highway 100
Australia
*Great Ocean Road
The Great Ocean Road is an Australian National Heritage listed stretch of road along the south-eastern coast of Australia between the Victorian cities of Torquay and Allansford. Built by returned soldiers between 1919 and 1932 and dedicated t ...
, Victoria
* Surf Coast Highway
The Surfcoast Highway (and its northern section within Geelong as Torquay Road, and its southern section as Surf Coast Highway) is a semi-rural highway in Victoria, Australia, connecting the city of Geelong with the coastal town of Torquay. Th ...
, Victoria
* Flinders Highway, South Australia
Flinders Highway connects the South Australian towns of Ceduna and Port Lincoln, a distance of Flinders Highway - along with Lincoln Highway - presents an alternative but somewhat longer coastal route between Ceduna and Port Augusta, compared ...
* Lincoln Highway, South Australia
Lincoln Highway is a highway in South Australia which links the cities of Port Augusta and Port Lincoln located on the east coast of Eyre Peninsula over a distance of . Lincoln Highway - along with Flinders Highway - presents an alternative but ...
Canada
* Alberta Highway 100 (Sherwood Park Freeway) (unsigned) * Manitoba Highway 100 (Perimeter Highway)
* New Brunswick Route 100
Route 100 is 49 kilometres long, and runs from Saint John to Hampton, New Brunswick.
Route 100 follows the through route across Saint John and the Kennebecasis Valley that was used prior to the construction of the Saint John Throughway and Mac ...
* Newfoundland and Labrador Route 100
Route 100 (also known as The Cape Shore Highway and Argentia Access Road) is a major highway in Newfoundland and Labrador. The highway begins at its northern terminus at the Trans-Canada Highway ( Route 1) in the town of Whitbourne, runs for u ...
* Niagara Regional Road 100, Ontario
* former Highway 100 (Ontario)
The Veterans Memorial Parkway (VMP, known as "Veterans" by locals) is a 13.4 kilometre (8.3 mi) Limited-access road, expressway located in the Provinces and territories of Canada, Canadian province of Ontario. The expressway was previously know ...
Costa Rica
* National Route 100
Croatia
* D100 road D1, D01, D.I, D.1 or D-1 can refer to:
Science and technology Biochemistry and medicine
* ATC code D01 ''Antifungals for dermatological use'', a subgroup of the Anatomical Therapeutic Chemical Classification System
* Dopamine receptor D1, a prote ...
Germany
* Bundesautobahn 100, the ''Berliner Stadtring'' (Berlin City Ring Road)
* Bundesstraße 100
India
* National Highway 100 (former, now National Highway 522 (India))Korea, South
* Seoul Ring Expressway
Malaysia
* A100 road (Malaysia), a road in Perak * Federal Route 100 (Lumut Bypass), a highway bypass in Manjung district, Perak
Mexico
* Sonora State Highway 100
Netherlands
* Stadsroute 100 (Amsterdam), the city center ring road
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
* , part of the London Inner Ring RoadUnited 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
* Indiana State Road 100 (former)
* Iowa Highway 100
* K-100 (Kansas highway) (former)
* 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 (former)
* New Jersey Route 100 (former)
** 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 (proposed)
* 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
;Territories:
* Puerto Rico Highway 100
See also
* List of highways numbered 100A * List of highways numbered 100B * List of highways numbered 100C * A100 (disambiguation), A100 {{Road index, 100