John d'Henin Hamilton, 3rd Baron Hamilton of Dalzell

John d'Henin Hamilton, 3rd Baron Hamilton of Dalzell, GCVO, MC (1 May 1911 – 31 January 1990), was Lord Lieutenant of Surrey from 12 March 1973 until 2 May 1986.

He was educated at Eton College and the Royal Military College, Sandhurst. He was an officer in the Coldstream Guards from 1931 to 1945, and served with his regiment during World War II. He fought with the regiment's 5th Battalion, which formed part of the Guards Armoured Division, in the Battle of Normandy, where he was injured on 18 July 1944.

In the 1960s, Hamilton was President of the National Association of Probation Officers.

In 1961, Hamilton made a trip to Kingston on Thames with Queen Elizabeth II. He was her Vice Lord Lieutenant. Lord Hamilton was appointed a Knight Grand Cross of the Royal Victorian Order (GCVO) in the 1987 New Year Honours.

Hamilton married Rosemary Coke in 1935. Her sister Celia was the grandmother of Jack Brooksbank, who married the Queen's granddaughter Princess Eugenie in 2018.