Early voting, also called advance polling or pre-poll voting, is a convenience voting process by which voters in a public election can vote before a scheduled election day. Early voting can take place remotely, such as via postal voting, or in person, usually in designated early voting polling stations. The availability and time periods for early voting vary among jurisdictions and types of election. The goals of early voting are usually to increase voter participation, relieve congestion at polling stations on election day, and avoid possible discrimination against people with work and travel schedules that may effectively prohibit them from getting to the polls during the hours provided in a single election day.

In some countries, early in-person voting or postal voting (or both) are available to all voters. In other countries, only some voters (such as those who are expected to be out of the country or hospitalized on election day) are eligible to cast ballots via these methods.

In addition to convenience and increased participation, early voting has proven advantageous for the smooth functioning of elections. When most voters cast their ballot on a single day, any problem can have a more damaging effect. More options to vote before Election Day provides more opportunities to identify and counteract problems including machine breakdown, cyberattack, human errors, or disinformation. When voting is spread out over several days, election officials can detect issues earlier, mitigate challenges more easily, counter false claims, and offer a greater number of options to any voters who may be impacted.

In Australia, where voting is compulsory, early voting is usually known as "pre-poll voting". Voters are able to cast a pre-poll vote for a number of reasons, including being away from the electorate, travelling, impending maternity, being unable to leave one's workplace, having religious beliefs that prevent attendance at a polling place, or being more than 8 km from a polling place. There were over 600 early voting centres available in 2016.

At the 2019 Australian federal election, 6.1 million votes were cast early (including postal votes), equating to 40.7 percent of total votes cast. This represented an increase from 26.4 percent at the 2013 election and 13.7 percent at the 2007 election. Following the 2019 elections, members of the parliamentary standing committee on electoral matters expressed concern about the length of the pre-poll voting period, suggesting that it was imposing costs on both the Australian Electoral Commission (AEC) and political parties, and that electors voting too early may be unable to respond to developments in the final weeks of the election campaign.

Hospitals and remote areas are served by Travelling Voting Booths.^{[citation needed]}

Early voting, or advance voting, has been possible in New Zealand without a reason since 2008. Advance voting opens 12 days before the election day, with around 500 polling booths set up across the country. Voters attending an appropriate advance polling booth for their electorate (constituency) can cast an ordinary vote in the same way they would if voting on election day. If the voter is outside the electorate, enrolled after the cutoff date (31 days before election day), or is on the unpublished roll, they must cast a special vote.

In the 2011 election, 334,600 advance votes were cast, representing 14.7% of all votes cast. This grew to 48% in the 2017 election and to 66.7% in the 2020 election