Gary Humphries (born July 6, 1958) is a member of the Australian Senate from the Australian Capital Territory. He represents the Liberal Party of Australia.

Humphries, though born in Sydney went to university in Canberra and worked as a solicitor and political adviser before his election to the ACT Legislative Assembly in 1989. He held a number of ministerial positions in several Liberal governments, most of them short lived. When Kate Carnell came to power in 1995, Humphries became a leading member of her team. In 1997 he became Deputy Chief Minister and in 1999 Treasurer (finance minister). In 2000 he succeeded Carnell as Chief Minister. At the 2001 ACT election Humphries was defeated by the Australian Labor Party under Jon Stanhope.

In early 2003 Humphries was chosen to fill a vacancy in the Senate. He is not expected to have serious problems with re-election in the immediate future. In 2004 there was speculation the Liberals would reject his preselection for the Senate spot, but he won the ballot unopposed.