Boii may refer to several ancient peoples:
Boii (Bohemia), a Celtic people of La Tène Bohemia and Moravia Boii (Cisalpine Gaul), a Celtic people of the Po plain in northern Italy Boii (Pannonia), a Celtic people of the middle Danube and the Carpathian Basin Boii (Gaul), a Celtic people settled among the Aedui in central Gaul
The same stem, boi, is also found in the names of ancient peoples that have been connected with the Boii: Boisci, a people of central Europe named by Ptolemy Boiates, a people of the Gironde estuary in Roman Aquitaine Basaboiates, a people of Roman Aquitaine
See also Boii (genus), genus of microsaur