Surname O'Laughlin (O'Laughlin 
) , worldwide, is a rare family name. The surname O'Laughlin is habitual in the United States, where it is a rare surname, Canada, and New Zealand, where it is a very rare surname. In absolute terms, this name is the most popular in the United States, Canada, and Australia.
| VARIANT | COUNTRY |
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| O'Laughlin | New Zealand, Canada, United States, Australia |
O'Loughlin, and Ó Lochlainn
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john callan o'laughlin American journalist (1873-1949), US (b. 1873) |
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| martin j. o'laughlin American politician – Minnesota -- "M.J." House 1903-06 (District 3), US (b. 1860) |
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| bridget o'laughlin (b. 1943) |
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| michelle o'laughlin researcher |
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| john p o'laughlin researcher |
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| dan o'laughlin college basketball player (1961–1962) Saint Mary's (CA) |
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| diane m o'laughlin researcher |
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| kelli n o'laughlin researcher (ORCID 0000-0003-3027-1883) |
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| cindy o'laughlin American politician, US |
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| jeanne o'laughlin co-founder of Barry University |
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| michael o'laughlin |
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