The Constitution Alteration (Industry and Commerce) Bill 1926,[1] was an unsuccessful proposal to alter the Australian Constitution to extend the Commonwealth legislative power in respect to corporations, and to give it the power to make laws with respect to trusts and combinations in restraint of trade, trade unions and employer associations.

It was put to voters for approval in a referendum held on 4 September 1926.

The proposal was to alter section 51 of the Constitution as follows: Section fifty-one of the Constitution is altered— industry and Commerce.

[1] The referendum was not approved by a majority of voters, and a majority of the voters was achieved in only two states, New South Wales and Queensland.

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