Abellio is a Celtic god.
Abellio may also refer to:
- Abellio (transport company), a bus and rail operator in Europe
- Abellio Deutschland, in Germany
- Abellio Surrey, a former bus operation in England
- Serco-Abellio, a British rail operator
- Transport UK London Bus, formerly Abellio London, a bus operator in London, England
- Raymond Abellio (1907–1986), French writer