Ross is a region of Scotland. One of the provinces of Scotland from the 9th century, it gave its name to a later earldom and to the counties of Ross-shire and, later, Ross and Cromarty. The name Ross allegedly derives from a Gaelic word meaning "headland", perhaps a reference to the Black Isle. Another possible origin is the West Norse word for Orkney – Hrossey – meaning horse island; the area once belonged to the Norwegian earldom of Orkney. Ross is a historical comital region, perhaps predating the Mormaerdom of Ross. It is also a region used by the Kirk, with the Presbytery of Ross being part of the Synod of Ross, Sutherland and Caithness.

Ross-shire is a historic county in the Scottish Highlands. The county borders Sutherland to the north and Inverness-shire to the south, as well as having a complex border with Cromartyshire – a county consisting of numerous enclaves or exclaves scattered throughout Ross-shire's territory. Ross-shire includes most of Ross along with Lewis in the Outer Hebrides. Dingwall is the traditional county town. The area of Ross-shire is based on that of the historic province of Ross, but with the exclusion of the many enclaves that form Cromartyshire.