Caithness may refer to:
Caithness (county of Scotland) Caithness (local government district, Highland region) Caithness (UK Parliament constituency) Caithness, New Brunswick, Canada, a community Earl of Caithness, a title in the Peerage of Scotland created four times, the first three being extinct Kate Caithness, Scottish curler Wilfrid Caithness (1883–1954), British actor Caithness Energy, a privately held, independent power producer in the United States Caithness Long Island Energy Center, Yaphank, New York, a power plant operated by the company Caithness RFC, a rugby union club from Thurso, Scotland Caithness Shinty Club, a defunct shinty team from Caithness, Scotland
See also Caithness Flagstone Group, a Devonian lithostratigraphic group (a sequence of rock strata) in northern Scotland