Auld was educated at Brooklands College and King's College London. He graduated with a first class honours degree in Law in 1958, obtained a doctorate in Law in 1963, and he became a fellow at King's College in 1987.
He was called to the bar at Gray's Inn in 1959 and became a Queen's Counsel in 1975. He became a Bencher at Gray's Inn in 1984. He was appointed a Recorder of the Crown Court in 1977, and became a judge of the High Court in 1987, appointed to the Queen's Bench Division, when he was knighted. He was promoted to the Court of Appeal in 1995, when he became a Privy Counsellor. He was the Senior Presiding Judge for England and Wales from 1995 to 1998. Following on from the review of civil justice undertaken by Lord Woolf, Auld undertook a review of the operation of the criminal courts in England and Wales in 1999 to 2001, producing a report known as the "Auld Report".
Sir Robin should not be confused with the singer/songwriter of the same name (middle name Morton) who had some success in South Africa on the Mountain Records label.