List of highways numbered 23
Route 23, or Highway 23, can refer to:
International
- European route E23
Australia
- Federal Highway
- Monaro Highway
- Dorat Road
Austria
- Autobahn Südosttangente Wien
Canada
- Alberta Highway 23
- British Columbia Highway 23
- Manitoba Highway 23
- Ontario Highway 23
- Prince Edward Island Route 23
- Saskatchewan Highway 23
Costa Rica
- National Route 23
Cuba
- Highway I–23
- * Highway 4–I–23
- * Highway 5–I–23
- * Highway 6–I–23
- Highway 2–23
Czech Republic
- I/23 Highway; Czech: Silnice I/23
Finland
- Finnish national road 23
Greece
- A23 road, a limited-access road from Komotini to the Makaza pass
India
- National Highway 23
Ireland
- N23 road
Israel
- Highway 23
Italy
- Autostrada A23
Japan
- Japan National Route 23
- Higashi-Meihan Expressway
- Ise Expressway
Korea, South
- National Route 23
- Gukjido 23
Malaysia
- Malaysia Federal Route 23
Mexico
- Mexican Federal Highway 23
New Zealand
- State Highway 23
Norway
- Norwegian National Road 23
United Kingdom
- British A23
- M23
- A23 road
United States
- U.S. Route 23
- Alabama State Route 23
- * County Route 23
- Arkansas Highway 23
- * Arkansas Highway 23W
- California State Route 23
- * County Route A23
- * County Route J23
- Colorado State Highway 23
- Delaware Route 23
- Florida State Road 23
- Georgia State Route 23
- Illinois Route 23
- Indiana State Road 23
- Iowa Highway 23
- K-23
- Louisiana Highway 23
- * Louisiana State Route 23
- Maine State Route 23
- Maryland Route 23
- *Maryland Route 23B
- Massachusetts Route 23
- M-23
- Minnesota State Highway 23
- * County Road 23
- * County Road 23
- * County Road 23
- Mississippi Highway 23
- Missouri Route 23
- *Missouri Route 23
- Montana Highway 23
- Nebraska Highway 23
- Nevada State Route 23
- New Jersey Route 23
- * County Route 23
- New Mexico State Road 23
- New York State Route 23
- * County Route 23
- * County Route 23
- * County Route 23
- * County Route 23
- * County Route 23
- * County Route 23
- * County Route 23B
- * County Route 23C
- * County Route 23
- * County Route 23
- * County Route 23
- * County Route 23
- * County Route 23
- * County Route 23
- * County Route 23
- * County Route 23
- * County Route 23
- * County Route 23
- * County Route 23
- * County Route 23
- * County Route 23
- * County Route 23
- * County Route 23
- * County Route 23
- * County Route 23
- * County Route 23
- North Carolina Highway 23
- North Dakota Highway 23
- * North Dakota Highway 23B
- * North Dakota Highway 23B
- Ohio State Route 23
- Oklahoma State Highway 23
- Oregon Route 23
- Pennsylvania Route 23
- South Carolina Highway 23
- South Dakota Highway 23
- Tennessee State Route 23
- Texas State Highway 23
- * Texas State Highway Loop 23
- * Texas State Highway Spur 23
- * Farm to Market Road 23
- * Texas Park Road 23
- Utah State Route 23
- Vermont Route 23
- State Route 23
- Washington State Route 23
- West Virginia Route 23
- Wisconsin Highway 23