A riding is an administrative jurisdiction or electoral district, particularly in several current or former Commonwealth countries.
The word riding is descended from late Old English *þriðing or *þriding (recorded only in Latin contexts or forms, e.g., trehing, treding, trithing, with Latin initial t here representing the Old English letter thorn). It came into Old English as a loanword from Old Norse þriðjungr, meaning a third part (especially of a county), cf. farthing. The modern form riding was the result of initial th being absorbed in the final th or t of the words north, south, east and west, by which it was normally preceded.
A common misconception holds that the term arose from some association between the size of the district and the distance that can be covered or encircled on horseback in a certain amount of time (cf. the Walking Purchase).
The term was used in Australia as a division of some shire councils, similar to a ward in city, borough, town and many shire councils.
The term was used in 19th century Canada to refer to subdivisions of counties.
In Canadian politics, "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 known as comté, i.e., "county", as the electoral districts in Quebec were historically identical to its counties; the official French term is circonscription.