Statute of Westminster Adoption Act 1947

The Statute of Westminster Adoption Act 1947 was a constitutional act of the New Zealand Parliament that formally accepted the full external autonomy offered by the British Parliament. By passing the Act, New Zealand adopted the Statute of Westminster 1931, an act of the British Parliament that granted full sovereign status and Commonwealth membership to the Dominions ratifying the statute. New Zealand was the last Dominion to ratify it (the Dominion of Newfoundland did not ratify it before becoming part of Canada in 1949).

At the time of its adoption in New Zealand, the Statute of Westminster was seen as a necessary constitutional step to clarify the sovereignty of the New Zealand Parliament, and not a change in New Zealand's relationship with its former coloniser, to which New Zealand politicians stressed continued loyalty. It has come to be regarded as an important step in the independence of New Zealand. Arguably the New Zealand Parliament was not a sovereign parliament until the act passed, as it was not able to make or unmake all law.

The Act was replaced and repealed by the Constitution Act 1986, which, among other provisions, removed all ability of the British Parliament to pass laws for New Zealand.