Boii is a name for 3 ancient Celtic tribes living in:
- Transalpine Gaul, modern France
- Cisalpine Gaul, or northern Italy
- modern Bohemia or the Czech Republic
Despite the derivation of the name, the ancient Boii should neither be confused with the inhabitants of what it now the modern state of Bavaria in Germany, nor those of Bohemia in the Czech Republic. An argument can be made for an early intermixing with Etruscans from Italy; however, the same argument can also be made for the Celtic tribes in any area they inhabited.