Surname Hartness (Hartness 
) , worldwide, is quite a rare cognomen. The cognomen Hartness is habitual in the United States, where it is a rare surname, the United Kingdom, and New Zealand. Not in comparison with a country's population, it is commonest in the United States, the United Kingdom, and Canada.
| VARIANT | COUNTRY |
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| Hartness | Belgium, Canada, Australia, United States, United Kingdom |
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james hartness American engineer and Vermont politician (1861–1934), US (b. 1861) |
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helen hartness flanders American collector of folk ballads, US (b. 1890) |
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| george hartness association football player (1872-1943), GB (b. 1872) |
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| ann hartness American librarian, US (b. 1936) |
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| henry hartness association football player, GB |
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| john g. hartness |
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