Family name Sadlier (Sadlier 
) , in all the world, is quite a rare surname. The cognomen Sadlier is characteristic of Ireland, where it is quite a rare surname, New Zealand, and Australia, where it is a rare surname. In absolute terms, the name is most common in the United States, Ireland, and Australia.
| VARIANT | COUNTRY |
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| Sadlier | New Zealand, Australia, United States, United Kingdom, Ireland |
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mary anne sadlier novelist, US (b. 1820) |
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anna t. sadlier Canadian writer, CA (b. 1854) |
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clifford sadlier Australian Victoria Cross recipient, AU (b. 1892) |
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| james edgar sadlier American physician (1865-1939), US (b. 1865) |
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| agnes l. sadlier (b. 1857) |
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| william sadlier American bishop (1867-1935), NZ (b. 1867) |
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| thomas ulick sadlier Irish genealogist and writer, IE (b. 1882) |
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| tom sadlier Australian rules footballer, AU (b. 1890) |
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| nicholas sadlier (b. 1881) |
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| matthew sadlier Titanic victim (b. 1892) |
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| bill sadlier Australian rugby league footballer, AU (b. 1896) |
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kieran sadlier Irish association football player, IE (b. 1994) |
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| r. a. sadlier researcher, AU (b. 1955) |
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| rosemary sadlier Black Canadian social justice activist, author, consultant, researcher and public speaker, CA (b. 1977) |
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| richard sadlier Irish footballer, IE (b. 1979) |
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