Who is eligible to vote depends on the particular election and the jurisdiction's constitution and electoral law. There is no universal worldwide list of requirements because countries and subnational authorities establish different franchises. Common eligibility conditions can include minimum age, citizenship or nationality, residence or connection with the relevant territory, registration and absence of specified legal disqualifications. Some countries allow non citizens to vote in particular local elections, while others restrict voting to citizens.
Age thresholds can also differ between elections within the same country. The United Kingdom provides a clear example of this variation. The Electoral Commission states that age and nationality requirements differ between England, Scotland, Wales and Northern Ireland and also vary according to the type of election being held.
In the United Kingdom, eligibility is election specific rather than determined solely by whether someone is generally a UK resident. For UK Parliamentary elections, the Electoral Commission states that a voter must be at least 18 on polling day, be a British, Irish or qualifying Commonwealth citizen, satisfy the relevant residence or overseas connection requirements and not be legally excluded.
Certain categories are specifically excluded from UK Parliamentary elections, including members of the House of Lords and some people detained following criminal conviction, subject to the detailed legal rules. Nationality rules for local elections can be different. British citizens, qualifying Commonwealth citizens and certain EU citizens can satisfy the nationality requirements for local government elections under specified conditions.
Age is an important component of electoral eligibility, but the age at which a person can register can differ from the age at which they can actually vote. In England, people can register from age 16 but cannot vote in elections until they are 18. Wales permits voting at 16 for Senedd and local government elections, while Scotland permits voting at 16 for Scottish Parliament and council elections but generally requires voters to be 18 for UK Parliamentary elections. Northern Ireland uses 18 as the voting age for its elections. These differences demonstrate why the question who is eligible to vote must identify the election and location rather than assuming one universal voting age across an entire country.
Citizenship and nationality are also important but do not operate identically everywhere. In UK Parliamentary elections, British, Irish and qualifying Commonwealth citizens can satisfy the nationality requirement, whereas certain other foreign nationals cannot. Local electoral franchises can be broader because certain qualifying EU citizens and other categories can have rights under the applicable legal framework. Historical changes in EU citizenship rights mean that the precise election and date must be considered.
The Electoral Commission's current guidance records specific retained rights for some EU citizens in local government elections. This illustrates a wider constitutional principle: voting eligibility is a legal status established by legislation and constitutional rules, not simply a consequence of living in a territory or paying taxes there.
Legal disqualification is another part of eligibility. A person may satisfy age, nationality and residence requirements but still be excluded by a specific legal rule. In the UK Parliamentary context, the Electoral Commission identifies certain categories of detained convicted persons, members of the House of Lords and persons convicted of specified corrupt or illegal electoral practices as subject to exclusions under the applicable rules. These restrictions illustrate why eligibility is more than a simple citizenship test. Electoral law combines positive qualifications with negative disqualifications. The exact rules can change through legislation and can differ between types of election, so claims about who can vote should always specify the election and the law applicable at the relevant time.
Registration is another essential condition in many electoral systems. A person may meet the substantive requirements for voting but still need to appear on the electoral register before receiving a ballot. In the United Kingdom, the Electoral Commission states that a person must be registered to vote in UK elections. Registration records connect the eligible person with an address or electoral jurisdiction and provide the administrative basis for issuing a ballot.
This means that eligibility and registration are separate concepts even though they interact closely. Eligibility determines whether the person has the legal entitlement to register and vote, while registration establishes the person's status within the election administration system. Deadlines can therefore affect whether an otherwise eligible person can participate in a particular election.
Eligibility can also depend on where the voter is located and whether the election has an overseas or territorial franchise. UK citizens living abroad can have voting rights in UK Parliamentary elections subject to the applicable registration requirements, while local elections generally depend on residence and local electoral status. Special registration categories can exist for service voters, overseas voters, anonymous electors and people without a fixed address.
These categories show that electoral law can accommodate unusual circumstances without eliminating the underlying requirements for establishing identity and entitlement. Eligibility is therefore a legal relationship between an individual and a particular electoral process, rather than a single permanent status that automatically applies to every election.
The most accurate answer to who is eligible to vote is therefore that eligible voters are those who satisfy the legal requirements for the particular election, including applicable age, nationality, residence, registration and disqualification rules. There is no universal global definition because electoral franchises vary across countries and between elections within countries. Even within the United Kingdom, the voting age, nationality rules and geographic qualifications differ between UK Parliamentary, local, devolved and other elections.
Any precise eligibility statement must therefore identify the jurisdiction, election type and relevant date. Eligibility should also be distinguished from registration, turnout and participation: eligibility establishes who may vote, registration records that status, turnout measures who actually cast ballots and participation can describe broader involvement in the electoral process.
