Major General Sir William John Victor Windeyer, KBE, CB, DSO & Bar, ED, QC, PC (28 July 1900 – 23 November 1987) was an Australian judge, soldier, educator, and a Justice of the High Court of Australia.

[5] In 1939, Windeyer assisted Justice Victor Maxwell at the Australian Government Royal Commission into the extension of Sydney GPO.

[9] In 1922 he was commissioned as a lieutenant in the Militia and attached to the Sydney University Scouts, being promoted to the rank of captain two years later.

[9][10] In 1940, following the outbreak of the Second World War, Windeyer volunteered for overseas service and joined the Second Australian Imperial Force (2nd AIF).

[11] Holding the rank of lieutenant colonel, he was tasked with raising and commanding the 2/48th Australian Infantry Battalion, part of the 9th Division.

One of his first judgments on the court was when he joined in the unanimous judgement of the court in a constitutional case Browns Transport Pty Ltd v Kropp[14] which considered whether the imposition of licensing fees under a state statute in relation to a licence for the carriage of goods amounts to the imposition of a duty of excise within the meaning of s. 90 of the Constitution, which denies to the States the power to impose such duties.

One of his sons, William Victor Windeyer, followed him into the legal profession and as of 2005 was a Judge of the Supreme Court of New South Wales; he also served in the military, receiving the Reserve Force Decoration.