List of A21 roads
This is a list of roads designated A21. Roads are sorted in the countries' alphabetical order.
- A21 road, a road in South Australia
- A21 motorway, a road connecting Altlengbach and the A1 to Vösendorf and the A2
- A21 road, a road connecting London with Hastings on the south coast
- A21 motorway, a road connecting Aix-Noulette and Douai
- A 21 motorway, a road connecting the road interchange with the A 1 at Bargteheide with Wankendorf
- A21 motorway, a road connecting Turin and Brescia
- A-21 motorway, a road connecting Jaca, Aragon and Pamplona, Navarre
- A 21 road, a road connecting Kegalle and Karawanella
- A21 road may refer to:
- * A21 road, a road
