New Zealand became the first country to introduce universal suffrage following the women's suffrage movement led by Kate Sheppard.

Women's suffrage was an important political issue in the late-nineteenth-century New Zealand. In early colonial New Zealand, as in European societies, women were excluded from any involvement in politics. Public opinion began to change in the latter half of the nineteenth century and after years of effort by women's suffrage campaigners, led by Kate Sheppard, New Zealand became the first nation in the world in which all women had the right to vote in parliamentary elections.

Universal suffrage or universal franchise ensures the right to vote for as many people bound by a government's laws as possible, as supported by the "one person, one vote" principle. For many, the term universal suffrage assumes the exclusion of the young and non-citizens. At the same time, some insist that more inclusion is needed before suffrage can be truly universal. Democratic theorists, especially those hoping to achieve more universal suffrage, support presumptive inclusion, where the legal system would protect the voting rights of all subjects unless the government can clearly prove that disenfranchisement is necessary. Universal full suffrage includes both the right to vote, also called active suffrage, and the right to be elected, also called passive suffrage.

Women's suffrage is the right of women to vote in elections. Several instances occurred in recent centuries where women were selectively given, then stripped of, the right to vote. In Sweden, conditional women's suffrage was in effect during the Age of Liberty (1718–1772), as well as in Revolutionary and early-independence New Jersey (1776–1807) in the US.

Katherine Wilson Sheppard was the most prominent member of the women's suffrage movement in New Zealand and the country's most famous suffragist. Born in Liverpool, England, she emigrated to New Zealand with her family in 1868. There she became an active member of various religious and social organisations, including the Women's Christian Temperance Union New Zealand. In 1887 she was appointed the WCTU NZ's National Superintendent for Franchise and Legislation, a position she used to advance the cause of women's suffrage in New Zealand.