List of highways numbered 45
The following highways are numbered 45:
International
- Asian Highway 45
- European route E45
Burma
- National Road 45
Canada
- Alberta Highway 45
- Manitoba Highway 45
- Ontario Highway 45
- Saskatchewan Highway 45
China
- G45 Expressway
- Asian Highway 45A
Dominican Republic
- DR-45 straddling the border with Haiti
Finland
- Finnish national road 45
France
- A45 autoroute
Germany
- Bundesautobahn 45
India
- National Highway 45
Iran
- Road 45
Japan
- Japan National Route 45
Korea, South
- Jungbu Naeryuk Expressway
- National Route 45
Mexico
- Mexican Federal Highway 45
New Zealand
- New Zealand State Highway 45
United Kingdom
- British A45
- British M45
United States
- Interstate 45
- U.S. Route 45
- * U.S. Route 45E
- * U.S. Route 45W
- Alabama State Route 45
- * County Route 45
- Arkansas Highway 45
- California State Route 45
- Colorado State Highway 45
- Connecticut Route 45
- Florida State Road 45
- * Florida State Road 45A
- Georgia State Route 45
- * Georgia State Route 45
- Idaho State Highway 45
- Illinois Route 45
- Indiana State Road 45
- Iowa Highway 45
- K-45
- Louisiana Highway 45
- Maryland Route 45
- *Maryland Route 45A
- *Maryland Route 45B
- *Maryland Route 45C
- *Maryland Route 45D
- *Maryland Route 45E
- Massachusetts Route 45
- M-45
- Minnesota State Highway 45
- Missouri Route 45
- Nebraska Highway 45
- * Nebraska Link 45B
- * Nebraska Spur 45A
- Nevada State Route 45
- New Hampshire Route 45
- New Jersey Route 45
- * County Route 45
- New Mexico State Road 45
- New York State Route 45
- * County Route 45
- * County Route 45A
- **County Route 45B
- * County Route 45
- * County Route 45
- * County Route 45
- * County Route 45
- * County Route 45
- * County Route 45
- * County Route 45
- * County Route 45
- * County Route 45
- * County Route 45
- * County Route 45
- * County Route 45
- * County Route 45
- * County Route 45
- * County Route 45
- ** County Route 45A
- * County Route 45
- * County Route 45
- North Carolina Highway 45
- North Dakota Highway 45
- Ohio State Route 45
- Oklahoma State Highway 45
- Pennsylvania Route 45
- South Carolina Highway 45
- South Dakota Highway 45
- Tennessee State Route 45
- Texas State Highway 45
- * Texas State Highway Spur 45
- * Farm to Market Road 45
- * Texas Park Road 45
- Utah State Route 45
- Virginia State Route 45
- West Virginia Route 45
- Wisconsin Highway 45