This is a list of roads designated A3. Roads entries are sorted in the countries alphabetical order. * A003 road (Argentina), a road connecting the junction with National Route 9 and Camino de Cintura to Tigre * A3 road (Australia) may refer to : * A3 (Sydney), a road connecting the Sydney's Northern Beaches to Sydney's Southern suburbs * A3 road (South Australia), a road connecting Plympton, Adelaide and Glen Osmond, Adelaide * A3 road (Tasmania), a road connecting Hobart and Launceston * Burnett Highway, Queensland * D'Aguilar Highway, Queensland * Gympie Road, Brisbane, Queensland * New England Highway, Queensland * A3 motorway (Austria), a road connecting Knoten Guntramsdorf and Ebreichsdorf * A3 motorway (Belgium), a road connecting Brussel and Liège * A3 motorway (Bulgari