Surname O'Loughlin (O'Loughlin 
) , worldwide, is quite a common family name. The family name O'Loughlin is habitual in Saint Kitts and Nevis, where it is a common surname, Ireland, where it is quite a common surname, and Australia, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in Australia, Ireland, and the United States.
| VARIANT | COUNTRY |
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| O'Loughlin | Australia, New Zealand, Ireland, United States, United Kingdom |
Loughlin, O'Laughlin, and Ó Lochlainn
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pat o'loughlin Australian rules footballer, AU (b. 1873) |
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| james o'loughlin (b. 1836) |
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| francis william norman o'loughlin Titanic victim (b. 1849) |
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| robert o'loughlin Irish dean (b. 1852) |
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| laurence o'loughlin (1854-1927) farmer and politician, AU (b. 1854) |
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| patrick o'loughlin Irish baseball player, IE (b. 1860) |
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joseph michael o'loughlin politician in Massachusetts, US, US (b. 1914) |
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| francis duffy o'loughlin Jesuit priest (b. 1869) |
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gerald s. o'loughlin American actor (1921-2015), US (b. 1921) |
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| silk o'loughlin American baseball player, US (b. 1872) |
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| jack o'loughlin Australian rules footballer, AU (b. 1873) |
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| mick o'loughlin Australian rules footballer, AU (b. 1876) |
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earl t. o'loughlin United States Air Force general, US (b. 1930) |
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| harold j. o'loughlin American politician – Minnesota -Senate 1955-62 (District 40), US (b. 1900) |
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| marina o'loughlin British journalist (b. 1901) |
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