Last name O'Reilly (O'Reilly 
, オライリー 
) , globally, is a common family name. The surname O'Reilly is habitual in Northern Europe, particularly Ireland, where it is a common surname, Jersey, where it is quite a common surname, and Guernsey (explore the name in all countries). Not in comparison with a country's population, it is commonest in Ireland, Australia, and the United Kingdom.
| hugh o'reilly Archbishop of Armagh; Bishop of Kilmore (b. 1581) |
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| edmund o'reilly Roman Catholic Archbishop of Armagh (b. 1598) |
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| philip o'reilly (b. 1599, d. in or after 1664), Irish rebel, IE (b. 1599) |
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| philip og o'reilly Irish politician (b. 1640) |
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alejandro o'reilly Irish military reformer in the Spanish Empire (1723-1794), IE (b. 1723) |
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| daniel o'reilly Catholic bishop (b. 1700) |
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bernard o'reilly Irish-American Catholic bishop (1803–1856) (b. 1803) |
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| franz karl o'reilly (1763-1802), CZ (b. 1763) |
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justo sierra o'reilly Mexican writer, MX (b. 1814) |
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myles william patrick o'reilly British politician (b. 1825) |
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| diego o'reilly Spanish military personnel, ES (b. 1775) |
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| alejandro o'reilly casas ES (b. 1769) |
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patrick thomas o'reilly Catholic bishop (b. 1833) |
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michael francis o'reilly Irish-American clergyman, IE (b. 1837) |
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| william o'reilly British politician (b. 1792) |
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