Statute of Westminster 1931
1931 c.4
An Act to give effect to certain resolutions passed by Imperial Conferences held in the years 1926 and 1930.
[11th December 1931]

Whereas the delegates of His Majesty’s Governments in the United Kingdom, the Dominion of Canada, the Commonwealth of Australia, the Dominion of New Zealand, the Union of South Africa, the Irish Free State and Newfoundland, at Imperial Conferences holden at Westminster in the years of our Lord nineteen hundred and twenty-six and nineteen hundred and thirty did concur in making the declarations and resolutions set forth in the Reports of the said Conferences:
And whereas it is meet and proper to set out by way of preamble to this Act that, inasmuch as the Crown is the symbol of the free association of the members of the British Commonwealth of Nations, and as they are united by a common allegiance to the Crown, it would be in accord with the established constitutional position of all the members of the Commonwealth in relation to one another that any alteration in the law touching the Succession to the Throne or the Royal Style and Titles shall hereafter require the assent as well of the Parliaments of all the Dominions as of the Parliament of the United Kingdom:
And whereas it is in accord with the established constitutional position that no law hereafter made by the Parliament of the United Kingdom shall extend to any of the said Dominions as part of the law of that Dominion otherwise than at the request and with the consent of that Dominion:
And whereas it is necessary for the ratifying, confirming and establishing of certain of the said declarations and resolutions of the said Conferences that a law be made and enacted in due form by authority of the Parliament of the United Kingdom:
And whereas the Dominion of Canada, the Commonwealth of Australia, the Dominion of New Zealand, the Union of South Africa, the Irish Free State and Newfoundland have severally requested and consented to the submission of a measure to the Parliament of the United Kingdom for making such provision with regard to the matters aforesaid as is hereafter in this Act contained:
Now, therefore, be it enacted by the King's most Excellent Majesty by and with the advice and consent of the Lords Spiritual and Temporal, and Commons, in this present Parliament assembled, and by the authority of the same, as follows :—

1 Meaning of “Dominion” in this Act.
In this Act the expression “Dominion” means any of the following Dominions, that is to say, the Dominion of Canada, the Commonwealth of Australia, the Dominion of New Zealand, . . . , the Irish Free State and Newfoundland.
Words repealed by South Africa Act 1962 (c. 23), Sch. 5

2 Validity of laws made by Parliament of a Dominion.
(1) The Colonial Laws Validity Act 1865 shall not apply to any law made after the commencement of this Act by the Parliament of a Dominion.
1865 c. 63.
(2) No law and no provision of any law made after the commencement of this Act by the Parliament of a Dominion shall be void or inoperative on the ground that it is repugnant to the law of England, or to the provisions of any existing or future Act of Parliament of the United Kingdom, or to any order, rule or regulation made under any such Act, and the powers of the Parliament of a Dominion shall include the power to repeal or amend any such Act, order, rule or regulation in so far as the same is part of the law of the Dominion.

3 Power of Parliament of Dominion to legislate extra-territorially.
It is hereby declared and enacted that the Parliament of a Dominion has full power to make laws having extra-territorial operation.

4 Parliament of United Kingdom not to legislate for Dominion except by consent.
No Act of Parliament of the United Kingdom passed after the commencement of this Act shall extend, or be deemed to extend, to a Dominion as part of the law of that Dominion, unless it is expressly declared in that Act that that Dominion has requested, and consented to, the enactment thereof.

5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S. 5 repealed (1.1.1996) by 1995 c. 21, ss. 314(1), 316(2), Sch. 12 (with ss. 312(1), Sch. 14 para. 1)

6 Powers of Dominion Parliaments in relation to Courts of Admiralty.
Without prejudice to the generality of the foregoing provisions of this Act, section four of the Colonial Courts of Admiralty Act 1890 (which requires certain laws to be reserved for the signification of His Majesty’s pleasure or to contain a suspending clause) and so much of section seven of that Act as requires the approval of His Majesty in Council to any rules of Court for regulating the practice and procedure of a Colonial Court of Admiralty, shall cease to have effect in any Dominion as from the commencement of this Act.
1890 c. 27.

7 Saving for British North America Acts and application of the Act to Canada.
(1) Nothing in this Act shall be deemed to apply to the repeal, amendment or alteration of the British North America Acts 1867 to 1930 or any order, rule or regulation made thereunder.
(2) The provisions of section two of this Act shall extend to laws made by any of the Provinces of Canada and to the powers of the legislatures of such Provinces.
(3) The powers conferred by this Act upon the Parliament of Canada or upon the legislatures of the Provinces shall be restricted to the enactment of laws in relation to matters within the competence of the Parliament of Canada or of any of the legislatures of the Provinces respectively.
S. 7 applied to Newfoundland as it applies to other provinces of Canada by British North America Act 1949 (c. 22), Sch. para. 48

8 Saving for Constitution Acts of Australia and New Zealand.
Nothing in this Act shall be deemed to confer any power to repeal or alter the Constitution or the Constitution Act of the Commonwealth of Australia or the Constitution Act of the Dominion of New Zealand otherwise than in accordance with the law existing before the commencement of this Act.

9 Saving with respect to States of Australia.
(1) Nothing in this Act shall be deemed to authorise the Parliament of the Commonwealth of Australia to make laws on any matter within the authority of the States of Australia, not being a matter within the authority of the Parliament or Government of the Commonwealth of Australia.
(2) Nothing in this Act shall be deemed to require the concurrence of the Parliament or Government of the Commonwealth of Australia in any law made by the Parliament of the United Kingdom with respect to any matter within the authority of the States of Australia, not being a matter within the authority of the Parliament or Government of the Commonwealth of Australia, in any case where it would have been in accordance with the constitutional practice existing before the commencement of this Act that the Parliament of the United Kingdom should make that law without such concurrence.
(3) In the application of this Act to the Commonwealth of Australia the request and consent referred to in section four shall mean the request and consent of the Parliament and Government of the Commonwealth.

10 Certain sections of Act not to apply to Australia, New Zealand or Newfoundland unless adopted.
(1) None of the following sections of this Act, that is to say, sections two, three, four, five and six, shall extend to a Dominion to which this section applies as part of the law of that Dominion unless that section is adopted by the Parliament of the Dominion, and any Act of that Parliament adopting any section of this Act may provide that the adoption shall have effect either from the commencement of this Act or from such later date as is specified in the adopting Act.
(2) The Parliament of any such Dominion as aforesaid may at any time revoke the adoption of any section referred to in subsection (1) of this section.
(3) The Dominions to which this section applies are the Commonwealth of Australia, the Dominion of New Zealand and Newfoundland.

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S. 11 repealed by Interpretation Act 1978 (c.30, SIF 115:1), Sch. 3

12 Short title.
This Act may be cited as the Statute of Westminster 1931.