A tribe of Gauls, who migrated to northern Italy, near Mutina (Modena)

Boii (a Latin plural) is the Roman name of an ancient Celtic tribe, living in Transalpine Gaul (modern France) and Cisalpine Gaul (northern Italy), and later in Pannonia (today Western Hungary), Bohemia, Moravia and western Slovakia. The European region of Bohemia owes its name to the Boii, via old German Boia-haim- = "home[land] of the Boii".