Nairnshire was 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 had a number of exclaves, the most considerable of which is situatated some distace away from the rump county in Inverness-shire. Another sizable portion existed in Ross-shire, on the Black Isle. These portions were transferred to their host territorities in 1889. Nairnshire county Council existed between 1889 and 1975 before the area was absorbed into the Highland region.