This is a list of roads designated A21. Roads are sorted in the countries' alphabetical order.
City Ring Route in Adelaide, South Australia South Gippsland Highway (Victoria, Australia) A21 (Toowoomba, Queensland) 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 A21 road (Sri Lanka), a road connecting Kegalle and Karawanella A21 road (United States of America) may refer to: A21 road (California), a road
See also List of highways numbered 21 List of 21A roads