This is a list of roads designated A21. Roads are sorted in the countries' alphabetical order. * A21 road (Australia), a road in South Australia * A21 (Toowoomba, QLD) * A21 motorway (Austria), a road connecting Altlengbach and the A1 to Vösendorf and the A2 * A21 road (England), a road connecting London with Hastings on the south coast * A21 motorway (France), a road connecting Aix-Noulette and Douai * A 21 motorway (Germany), a road connecting the road interchange with the A 1 at Bargteheide with Wankendorf * A21 motorway (Italy), a road connecting Turin and Brescia * A-21 motorway (Spain), a road connecting Jaca, Aragon and Pamplona, Navarre * A 21 road (Sri Lanka), a road connecting Kegalle and Karawanella * A21 road (United States of America) may refer to: * A21 road (Calif