Last name Postlethwaite (Postlethwaite 
) , all over the world, is quite a rare cognomen. The surname Postlethwaite is habitual in the United Kingdom, where it is quite a rare surname, Australia, where it is a rare surname, and New Zealand. Measured by absolute frequency, the name is most common in the United Kingdom, the United States, and Australia.
| VARIANT | COUNTRY |
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| Postlethwaite | United Kingdom, Mexico, Canada, Australia, United States |
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thomas postlethwaite mathematician, GB (b. 1731) |
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| samuel postlethwaite (1772-1824) (b. 1772) |
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| matilda rose postlethwaite (1807-1881) (b. 1807) |
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| william d postlethwaite (1810-1863) (b. 1810) |
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| eliza postlethwaite (1812-1886) (b. 1812) |
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| dinah postlethwaite (1815-1885) (b. 1815) |
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| amelia colter postlethwaite (1818-1876) (b. 1818) |
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| margaret postlethwaite (1820-1891) (b. 1820) |
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| william postlethwaite English-born Member of Parliament of New Zealand (1829-1908), GB (b. 1829) |
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| samuel postlethwaite (1833-1876) (b. 1833) |
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| susan postlethwaite (1835-1909) (b. 1835) |
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pete postlethwaite English character actor (1946–2011), GB (b. 1946) |
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| alexander lathrop postlethwaite (1912-2000) (b. 1912) |
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| t. neville postlethwaite pedagogue (b. 1933) |
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matthew postlethwaite British actor and singer, GB (b. 1991) |
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