Surname O'Neil (O'Neil 
, オニール 
, אוניל 
) , across the world, is a common cognomen. The family name O'Neil is characteristic of Jersey, where it is quite a common surname, Trinidad and Tobago, and Australia, where it is quite a rare surname. Not in comparison with a country's population, it most frequently occurs in the United States, Canada, and Australia. Much less frequently, O'Neil is the forename as well as the last name.
| peter o'neil (1757-1835) Roman Catholic priest (b. 1757) |
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henry nelson o'neil English painter (1817-1880), RU (b. 1817) |
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| james a. o'neil American pioneer, US (b. 1800) |
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william t. o'neil American politician (1850–1909), US (b. 1850) |
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| neil o'neil (b. 1792) |
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| christie ann o'neil (b. 1793) |
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kitty o'neil American dancer, US (b. 1855) |
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eugene j. o'neil politician in Massachusetts, US (born 1856), US (b. 1856) |
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john william o'neil politician in Massachusetts, US (1859-1902), US (b. 1859) |
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| robert o'neil American politician – Minnesota -House 1857-58 (District 3), US (b. 1811) |
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leo francis o'neil American catholic priest, US (b. 1878) |
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dennis a. o'neil politician in Massachusetts, US, US (b. 1882) |
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| john o'neil American photographer (1834-1907), US (b. 1834) |
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peggy o'neil Irish-American actress (1894-1960), IE (b. 1894) |
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| james knox o'neil American artist (b. 1847) |
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