An electoral district (also known as a constituency, riding, ward, division, electoral area or electorate) is a distinct territorial subdivision for holding a separate election for one or more seats in a legislative body. Generally, only voters who reside within the geographical bounds of an electoral district (constituents) are permitted to vote in an election held there.

The names for electoral districts vary across countries and, occasionally, for the office being elected. The term constituency is commonly used to refer to an electoral district; it can also refer to the body of eligible voters within the represented area. Similarly, in Australia and New Zealand, electoral districts are called electorates, however elsewhere the term electorate generally refers specifically to the body of voters.

In Canada, districts are colloquially called ridings (stemming from an earlier British geographical subdivision). Local electoral districts are sometimes called wards, a term which also designates administrative subdivisions of a municipality. In local government in the Republic of Ireland voting districts are called electoral areas.