Last name Hardcastle (Hardcastle 
) , all around the world, is quite a common cognomen. The last name Hardcastle is characteristic of the United Kingdom, where it is quite a rare surname, Australia, and New Zealand. In absolute terms, it most frequently occurs in the United States, the United Kingdom, and Australia.
| VARIANT | COUNTRY |
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| Hardcastle | United Kingdom, Australia, Ghana, United States, Canada |
| thomas hardcastle English clergyman and ejected minister (b. 1637) |
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| elizabeth cleveland hardcastle US (b. 1741) |
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| joseph hardcastle British merchant and philanthropist, GB (b. 1752) |
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| alfred hardcastle Peerage person ID=199062 (b. 1791) |
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| mary hardcastle (1795-1871) (b. 1795) |
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| emma corsbie hardcastle (1800-1867) (b. 1800) |
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| nathaniel hardcastle (b. 1793) |
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edward hardcastle English cricketer and Anglican priest, GB (b. 1862) |
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| joseph hardcastle British politician, GB (b. 1815) |
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| edward hardcastle British politician (b. 1826) |
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| charlotte hardcastle New Zealand botanical artist (1828-1908), NZ (b. 1828) |
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| edward hardcastle (b. 1825) |
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| walter hardcastle British cricketer (1843-1901) (b. 1843) |
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| frank hardcastle British politician (1844-1908) (b. 1844) |
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| john hardcastle New Zealand amateur scientist (1847-1927), NZ (b. 1847) |
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