Last name O'Flanagan (O'Flanagan 
) , throughout the world, is a rare cognomen. The cognomen O'Flanagan is characteristic of Ireland, where it is quite a rare surname, Australia, where it is a rare surname, and the United Kingdom. Not in comparison with a country's population, it is commonest in Ireland, the United Kingdom, and the United States. Very seldom, O'Flanagan is the forename as well as the last name.
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| O'Flanagan | Australia, Ireland, Canada, United States, United Kingdom |
| theophilus o'flanagan Irish teacher, translator and scholar (b. 1762) |
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| james roderick o'flanagan Irish barrister-at-law and writer, IE (b. 1814) |
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michael o'flanagan Irish priest and activist (1876-1942) (b. 1876) |
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| robert dermot o'flanagan Catholic bishop, IE (b. 1901) |
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| kevin o'flanagan Irish footballer (1919-2006), IE (b. 1919) |
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| mick o'flanagan Irish footballer (1922-2015), IE (b. 1922) |
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| patrick o'flanagan Irish geographer, IE (b. 1947) |
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| sheila o'flanagan Irish writer and journalist, IE (b. 1958) |
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| tom o'flanagan (b. 1949) |
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| rob o'flanagan (b. 1959) |
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| eugene o'flanagan Roman Catholic bishop |
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| peter o'flanagan Peerage person ID=543990 |
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| teresa o'flanagan (died 1817) |
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| margaret o'flanagan Peerage person ID=543991 |
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| james o'flanagan Peerage person ID=377664 |
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Mr, Paul, Ross, Rory, Rhys, Ryan, Dave, Dawn, Duke, Gary, Kate, Gina, Liam, Lois, Lucy, Luke, Jack, John, Jill, Todd, Tina, Lisa, Bill, Clay, Carl, Ms, Sam, Ann, Ben, Pam, Rob, Don, Jan, Joy, Tom, Tim, Mary, Mark, Mick, Mike, Sean, Alan, Ally, Anna, Anne, Anja, Noel, and Neil