New Guinea Act 1920
Parliament of Australia
Long title An Act to make provision for the Acceptance of a Mandate for the Government of certain Territories and Islands in the Pacific Ocean and to make immediate provision for the Civil Government of the said Territories and Islands for other purposes.
Royal assent	30 September 1920
Commenced	19 May 1921
Related legislation
Papua and New Guinea Act 1949
Status: Repealed

The New Guinea Act 1920 was an Act passed by the Parliament of the Commonwealth of Australia, which saw the transfer of the territory of German New Guinea from Germany to Australia under terms of the Treaty of Versailles.

The Act formally established New Guinea as a League of Nations Mandated Territory that was to be administered by Australia.^[1] The Act remained in effect until New Guinea's merger with Papua following the passage of the Papua and New Guinea Act 1949.