In the British Isles since Anglo-Saxon times, a riding is traditionally a sub-division (especially in three) of a county.
The term has similar or analogous meanings in other countries.
A common misconception holds that the term arose from some association between the size of the district and the distance that can be covered on horseback in a certain amount time.
In Norway, however, the thrithjungr seems to have been an ecclesiastical division.
Each of the ridings of Yorkshire has its own Lord Lieutenant and commission of the peace, and under the Local Government Act of 1888 formed a separate administrative county.
The Yorkshire ridings had separate county councils until 1974. A local government body called East Riding of Yorkshire was re-established in 1996.
According to the 12th-century compilation known as the laws of Edward the Confessor, the riding was the third part of a county (provincia); to it causes were brought which could not be determined in the wapentake, and a matter which could not be determined in the riding was brought into the court of the shire.
There is abundant evidence that riding courts were held after the Norman Conquest. A charter which Henry I granted to the Church of St Peters at York mentions wapentacmot, tridingmot and shiresmot (-mot designates popular assemblies), and exemptions from suit to the thriding or riding may be noticed frequently in the charters of the Norman kings. As yet, however, the jurisdiction and functions of these courts have not been ascertained. It seems probable from the silence of the records that they had already fallen into disuse early in the 13th century.
Lindsey, a subdivision of Lincolnshire, also possessed ridings, in this case the North, West, and South ridings.
County Cork was divided into East and West Ridings in 1823. The ridings still exist for judicial purposes, and Garda Siochana divisions are based on them. Cork county council is divided for some purposes into the two ridings, with councillors for the ridings meeting separately to perform some functions.
In Canadian politics, a "riding" is a colloquial term for a constituency or electoral district. Officially, "electoral district" is generally used, although government documents sometimes use the colloquial term. In colloquial Canadian French, a riding is confusingly known as comté, i.e. "county", as the electoral districts in Quebec were historically identical to its counties; the official French term is circonscription.
The Canadian use of "riding" is derived from the English local government term, which was widely used in Canada in the 19th century. Most Canadian counties never had sufficient population to justify administrative sub-divisions. Nonetheless, it was common, especially in Ontario, to divide counties with sufficient population into multiple electoral districts, which thus became known as "ridings" in official documents. Soon after Confederation, the urban population grew (and more importantly, most city dwellers gained the franchise after property ownership was no longer required to gain the vote). Rural constituencies therefore became geographically larger through the 20th century and generally encompassed one or more counties each, and the word "riding" was then used to refer to any electoral division.
The local association for a political party is known as a riding association.