Arthur O'Neill (1876–1914) was an Irish Unionist politician.
Arthur O'Neill or Art O'Neill may refer to: Blessed Arthur O'Neilly (died 1282), Irish born Trinitarian priest who was captured by slavers in Egypt and martyred Art Oge O'Neill (died 1519), head of the O'Neill dynasty Arthur O'Neill (soldier) (died 1600), Gaelic Irish landowner Art MacBaron O'Neill (died 1618), Gaelic Irish landowner Arturo O'Neill (1736–1814), Irish-born Spanish soldier Arthur O'Neill (harpist) (1737–1816), Irish musician Arthur Joseph O'Neill (1917–2013), American bishop of the Roman Catholic Church Arthur O'Neill (rugby union), English international rugby union player