| Country: | ESP |
| Province: | B |
| Type: | Autovia |
| Route: | B-21 |
| Maint: | Ministerio de Fomento |
| Terminus A: | Autovía A-2, Autovía B-20 |
| Terminus B: | Port of Barcelona |
The Autovía B-21 is a Spanish motorway that is an access road to the Port of Barcelona from the A-2 and the B-20 (Ronda de Dalt).[1]