Family name O'Kelley (O'Kelley 
) , all over the world, is a rare last name. The cognomen O'Kelley is habitual in the United States, where it is a rare surname, New Zealand, and Canada, where it is an extremely rare surname.
| VARIANT | COUNTRY |
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| O'Kelley | New Zealand, Canada, United Kingdom, United States |
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edward capehart o'kelley American outlaw, US (b. 1857) |
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| mattie lou o'kelley American artist (b. 1908) |
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| emily mattie lou o'kelley American artist, US (b. 1908) |
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| william clark o'kelley United States federal judge (1930-2017), US (b. 1930) |
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erin o'kelley American beauty pageant contestant, US (b. 1986) |
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| alannah o'kelley IE (b. 1955) |
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| tricia o'kelley American actress, US (b. 1968) |
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| brian o'kelley Chief Executive Officer and Founder - AppNexus, Inc. (b. 1977) |
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| raymond f. o'kelley author |
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| herschel o'kelley college basketball player (1956–1958) Southern Methodist |
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| robert o'kelley college basketball player (1998–2001) Wake Forest |
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| terrance o'kelley college basketball player (1992–1995) Cal State Long Beach |
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