Caio may refer to:
* Caio (name), a Portuguese given name derived from the Latin given name Gaius
* Caio, Carmarthenshire, a village in west Wales
* Caio (moth), ''Caio'' (moth), a genus
* Italian destroyer Caio Duilio, Italian destroyer ''Caio Duilio'', a destroyer of the Italian Navy
See also
*Caius (disambiguation)
*Gaius
{{Disambiguation