Ailill (Ailell, Oilioll) a popular male given name in medieval Ireland and may refer to:
- Ailill mac Máta, legendary king of Connacht and husband of queen Medb
- Ailill mac Slanuill, legendary High King of Ireland of the 12th century BC
- Ailill Finn, legendary High King of the 8th century BC
- Ailill Caisfhiaclach, legendary High King of the 5th century BC
- Ailill mac Echach Mugmedóin, half-brother of Niall of the Nine Hostages (5th century AD)
- Ailill Molt, High King of the 5th century AD
- Ailill Inbanda (died c. 549), King of Connacht
- Ailill Cruitire (died c. 637), King of Brega
- Ailill Medraige mac Indrechtaig (died 764), King of Connacht
- Ailill, Bishop of Clogher of the 9th century AD
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