Arthur O'Neill (disambiguation)
Arthur O'Neill was an Irish Unionist politician.
Arthur O'Neill or Art O'Neill may refer to:
- Blessed Arthur O'Neilly, Irish born Trinitarian priest who was captured by slavers in Egypt and martyred
- Art Oge O'Neill, head of the O'Neill dynasty
- Arthur O'Neill (soldier), Gaelic Irish landowner
- Art MacBaron O'Neill, Gaelic Irish landowner
- Arturo O'Neill, Irish-born Spanish soldier
- Arthur O'Neill (harpist), Irish musician
- Arthur Joseph O'Neill, American bishop of the Roman Catholic Church
- Arthur O'Neill (rugby union), English international rugby union player