Cognomen Caithness (Caithness 
) , around the world, is a rare last name. The last name Caithness is habitual in Australia, where it is a rare surname, the United Kingdom, and New Zealand. In absolute terms, it is commonest in the United Kingdom, Australia, and Canada. Very seldom, Caithness is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Caithness | United Kingdom, South Africa, Australia, United States, Canada |
| john of caithness Scottish bishop (b. 1101) |
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| aindréas of caithness bishop of Caithness, GB (b. 1101) |
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lady caithness Spiritualist and theosophist, editor, GB (b. 1830) |
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| caithness brodie of the druim Peerage person ID=188163 (b. 1842) |
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| wilfrid caithness actor (1883-1954), GB (b. 1883) |
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kate caithness Scottish curler, president of World Curling Federation, GB (b. 1945) |
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| moddan of dale in caithness Peerage person ID=198277 |
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| beatrix caithness (died 1959) |
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| james e. caithness Peerage person ID=270835 |
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| robert caithness soldier of the Argyll and Sutherland Highlanders, GB |
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| caroline anne caithness (died 1917) |
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| kristina caithness researcher (speech pathology) |
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| alexander sutherland of caithness One of the people associated with the witch trials in Scotland, GB |
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| neil caithness researcher ORCID ID = 0000-0002-6234-4285 |
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| june caithness Peerage person ID=425330 |
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