Cognomen O'Riley (O'Riley 
) , around the globe, is a rare family name. The cognomen O'Riley is characteristic of Australia, where it is a rare surname, New Zealand, and Canada. Not in comparison with a country's population, this name is the most popular in Australia, the United States, and the United Kingdom.
| VARIANT | COUNTRY |
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| O'Riley | Canada, United Kingdom, United States, New Zealand, Australia |
| bernard cornelius o'riley Roman Catholic bishop (b. 1868) |
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don o'riley American baseball player, US (b. 1945) |
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christopher o'riley American musician, US (b. 1956) |
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| austin o'riley US (b. 1980) |
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| matt o'riley English association football player (born 2000), GB |
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