Nairnshire is a small traditional county of Scotland, centred around Nairn, the traditional county town. The rump of the county borders Inverness-shire to the west and south, and Morayshire to the east. It has a northern coastline onto the Moray Firth.

Nairnshire has a number of exclaves, the most considerable of which is situatated some distace away from the rump county in Inverness-shire. Another sizable portion exists in Ross-shire, on the Black Isle, around the village of Urqhart . Other, smaller detached parts also exist in Morayshire (not shown on map due to their small size).

On the creation of the administrative county of the same name in 1889, these portions were considered to be part of their host territorities. Nairnshire County Council existed between 1889 and 1975, after which time the area was (and continues to be) administered as part of the "Highland" region.