The New Zealand Constitution Act 1852 (15 & 16 Vict. c. 72) was an Act of the Parliament of the United Kingdom that granted self-government to the Colony of New Zealand. It was the second such Act, the previous 1846 Act not having been fully implemented.
The Act remained in force as part of New Zealand's constitution until it was repealed by the Constitution Act 1986.
The long title of the Act was "An Act to Grant a Representative Constitution to the Colony of New Zealand". The Act received the Royal Assent on 30 June 1852.
The New Zealand Company, which was established in 1839, proposed that New Zealand should have representative institutions, and this was consistent with the findings of the Durham Report, which was commissioned during 1838 following minor rebellions in Upper and Lower Canada. The first settlement of the company, Wellington, briefly had its own elected council during 1840, which dissolved itself on the instruction of Lieutenant Governor William Hobson. The first New Zealand Constitution Act was passed in 1846, though Governor George Grey was opposed to its proposed division of the country into European and Māori districts. As a result, almost all of the Act was suspended for six years pending the new Act of 1852, the only operative part of the 1846 Act being the creation of New Zealand's first provinces, New Ulster Province and New Munster Province. In the meantime, Grey drafted his own Act which established both provincial and central representative assemblies, allowed for Māori districts and an elected Governor. Only the latter proposal was rejected by the Parliament of the United Kingdom when it adopted Grey's constitution.