Gary John Joseph Humphries AO (born 6 July 1958) is a Deputy President of the Administrative Appeals Tribunal.

He worked as a solicitor, a legal office in the ACT Administration, prior to self-government, and political advisor to Senator Amanda Vanstone.

[4] Humphries variously served in a range of shadow ministerial roles in the Kaine and Carnell oppositions.

The Australian Labor Party, led by Jon Stanhope formed Government with the support of the ACT Greens and Democrats.

[2] In December 2002, Humphries was elected by the party membership as nominee to fill a forthcoming casual vacancy in the Senate caused by the announced resignation of Margaret Reid.

[9] The profile of the campaign was bolstered by polling that suggested that, for the first time, a Liberal Senator might struggle to retain their seat in the ACT.

[10][11] Humphries was the first Liberal senator to vote against the Howard Government in its 11.5 years in office,[12] when he voted to reverse the Federal Government's ban on the ACT's civil unions law in the Senate, claiming that the Commonwealth should not be able to automatically overturn ACT legislation.

[20] One critique in particular, about the Canberra Liberals losing touch with the ACT community, raised the committee's ire, and drew a public rebuke from Hanson.

[21] A faction called the Menzies Group was organised in response to the preselection result and the perception that the far right of the Canberra Liberals was running the party.

In an email, he told supporters that the Canberra Liberal Party in its current state was, amongst other things, undemocratic, still out of touch with the ACT community, unable to control its finances, and dominated by its far right.