Walter John Holt QC (7 May 1929 – 9 March 2012) was an Australian politician and judge.
He was a Liberal member of the New South Wales Legislative Council from 1972 to 1984, and was Deputy Leader of the Opposition in the Upper House from 1976 to 1977.
He was educated at Barker College in Hornsby from 1938 to 1944 and at the University of Sydney, where he was awarded a Bachelor of Law in 1952.
An RAAF reserve, he was a pilot officer with the Sydney University Squadron in 1952, and was called to the bar in 1954.
In 1976, the year he and his wife Eleanor divorced, he became Deputy Leader of the Opposition in the Legislative Council, holding that position until 1977.