Ian Douglas Macdonald AM (born 29 November 1945) is an Australian former politician who served as a Senator for Queensland from 1990 to 2019, representing the Liberal Party.

He was defeated at the 2019 federal election, having been the longest-serving incumbent member of parliament for the final years of his career.

[4] In June 2014, Macdonald joined Senator Cory Bernardi in expressing opposition to the Government's proposed deficit levy, claiming that he did not believe the increase "goes far enough.

SA Labor Senator Penny Wong interrupted proceedings later to have Macdonald withdraw his comment.

[citation needed] On 9 February 2017, Macdonald stated that he was likely to oppose the Federal Government move to abolish the lifetime gold pass, entitling politicians who had been elected prior to 2012 to 10 free business class flights per year.

ABC News reported that Macdonald stated in the Liberal Party Room that "it's about time someone stood up for politicians entitlements".

[13][14] On 9 April 2019, Macdonald asked if Penny Wong is related to Chinese billionaire Huang Xiangmo.