Organised irreligion in New Zealand has roots in the freethought movement of the nineteenth century, when secularist associations promoted science, rational inquiry, and the separation of church and state. Two premiers,
Robert Stout and
John Ballance, were noted freethinkers, reflecting the influence of secularist ideas in public life. The most enduring institutional body is the
New Zealand Rationalist and Humanist Association (NZRHA), founded in the 1920s, which has campaigned for secular education, the repeal of blasphemy laws, and the removal of religious privilege in legislation. Other groups include the
Humanist Society of New Zealand, which emphasises human rights and social justice, and the
NZ Skeptics, established in the late twentieth century to promote scientific inquiry and critique pseudoscience. More recently, global networks such as Atheist Republic have established local chapters, providing community for non‑believers. Although membership in these organisations is modest compared to religious denominations, they have played a visible role in public debates on education, law, and secular policy, reflecting the broader growth of irreligion in New Zealand society. == Repeal of blasphemy law ==