List of highways numbered 451
The following highways are numbered 451:
Canada
- Ontario Highway 451, commonly called the Queen Elizabeth Way.
Japan
- Japan National Route 451
Korea, South
- Jungbu Naeryuk Expressway Branch
United Kingdom
- from Stourbridge to Great Witley
United States
- Florida State Road 451
- Kentucky Route 451
- Louisiana Highway 451
- Maryland Route 451
- New Mexico State Road 451
- Oregon Route 451
- Puerto Rico Highway 451
- Tennessee State Route 451
- Texas
- * Farm to Market Road 451
- Wyoming Highway 451