Sir William Marcus Gage (22 April 1938 – 13 September 2023) was a British judge.
Like his father, William was educated at Repton School and Sidney Sussex College, Cambridge.
As a barrister, he defended Dr Ann Dally, who was disciplined by the General Medical Council for prescribing controlled drugs to addicts in the 1980s.
He wrote "My judgment is that they constituted an appalling episode of serious, gratuitous violence on civilians which resulted in the death of one man and injuries to others.
They represent a very serious breach of discipline by a number of members of 1QLR [1st Battalion, The Queen's Lancashire Regiment].