Surname O'Sullivan (O'Sullivan 
, О'Салліван 
) , around the globe, is a common cognomen. The last name O'Sullivan is characteristic of Ireland, where it is a common surname, British Virgin Islands, where it is quite a common surname, and Australia (explore the name in all countries). Measured by absolute frequency, it is the most numerous in Ireland, Australia, and the United Kingdom.
| philip o'sullivan beare 1590-1660 Irish author (b. 1590) |
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john l. o'sullivan American politician (1813-1895), US (b. 1813) |
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patrick o'sullivan (1818-1904) politician, IE (b. 1818) |
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cornelius o'sullivan politician in Massachusetts, US (1825-1879), US (b. 1825) |
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william o'sullivan politician, died 1887 (b. 1829) |
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| joseph-denis o'sullivan NL (b. 1771) |
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| jean-patrice o'sullivan (b. 1776) |
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timothy o'sullivan American photographer, US (b. 1840) |
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| samuel o'sullivan (1790–1851), Church of Ireland clergyman, IE (b. 1790) |
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edward william o'sullivan politician and journalist in New South Wales, Australia, AU (b. 1846) |
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thomas o'sullivan Australian politician and judge (1856-1953), AU (b. 1856) |
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edward f. o'sullivan politician in Massachusetts, US (1858-1904), US (b. 1858) |
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thomas c. o'sullivan American politician, US (b. 1858) |
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| anthony o'sullivan (b. 1808) |
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william o'sullivan Irish politician and medical doctor, IE (b. 1873) |
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