Route 420 or Highway 420 may refer to:
Australia
Bass Highway (Victoria)- South Gippsland Freeway
- South Gippsland Highway
- Bass Highway
- Phillip Island Road
Canada
Ireland
Japan
Norway
Spain
United Kingdom
United States
- Interstate 420 (two unbuilt freeways)
- U.S. Route 420
- Florida State Road 420 (former)
- County Road 420 (Orange County, Florida)
- Louisiana Highway 420
- Indiana State Road 420 (now Interstate 94).
- New Mexico State Road 420
- New York State Route 420
- Ohio State Route 420
- Pennsylvania Route 420
- Puerto Rico Highway 420
- South Carolina Highway 420
- Tennessee State Route 420
- Farm to Market Road 420
- Virginia State Route 420
- Kentucky State Route 420
| Preceded by 419 |
Lists of highways 420 |
Succeeded by 421 |
