Ralph Willis AO (born 14 April 1938) is an Australian former politician who served as a Cabinet Minister during the entirety of the Hawke-Keating government from 1983 to 1996, most notably as Treasurer of Australia from 1993 to 1996 and briefly in 1991.

They worked closely together over a ten-year period, preparing and presenting national wage cases to the Commonwealth Conciliation and Arbitration Commission.

He remained in the position until his election to parliament in 1972, with one of his last cases before the commission being a successful argument for gender equality in award wages.

Willis was duly appointed as Treasurer for a second time by Keating, and was responsible for helping to roll-out the Government's major 'One Nation' economic package on which it had won the 1993 election, including a round of middle-income tax cuts and the establishment of a national infrastructure commission.

Known as the Ralph Willis letter, it suggested that a Coalition government led by John Howard would cut grants to the states.

However, media examination quickly revealed the letter to be a forgery, allegedly foisted on Willis by Melbourne University Liberal Club students.

Willis was one of only three people to be a member of the Cabinet continuously during the Hawke-Keating government between 1983 and 1996, the other two being Kim Beazley and Gareth Evans.