A33, A 33 or A-33 may refer to:
Roads A33 road (England), connecting Reading and Southampton A33 motorway (France), connecting Nancy and Dombasle-sur-Meurthe A 33 motorway (Germany), connecting the A 30 in the north and the A 44 in the south A33 motorway (Italy), under construction, connecting Asti and Cuneo A33 motorway (Spain), proposed, in Murcia connecting Cieza and Font de la Figuera A33 road (Sri Lanka), connecting Ja Ela-Ekala-Gampaha-Yakkala A33 road (Botswana), in Botswana
Other uses Douglas A-33, a 1941 American fighter aircraft A33 Excelsior, a British tank prototype HLA-A33, a human serotype Samsung Galaxy A33 5G, an Android smartphone English Opening in chess (Encyclopaedia of Chess Openings code A33, among others)