List of highways numbered 521
# List of highways numbered 521

The following highways are numbered 521:

## Canada

* Alberta Highway 521

## United States

* U.S. Route 521
* Maryland Route 521
* County Route 521 (New Jersey)
* Ohio State Route 521
* Puerto Rico Highway 521
* South Carolina Highway 521

| Preceded by 520 | Lists of highways 521 | Succeeded by 522 |
| - | - | - |
