Sir John Lindsay Eric Smith CH CBE (3 April 1923 – 28 February 2007) was a British banker, Conservative Member of Parliament, and Lord Lieutenant of Berkshire.
His elder sister, Fortune, married Hugh FitzRoy, Earl of Euston (later 11th Duke of Grafton) in 1946; she was a Lady of the Bedchamber to Queen Elizabeth II from 1953 and 1966, and was the Mistress of the Robes from 1967 until her death 3 December 2021.
He joined the aircraft carrier HMS Indomitable, and served in the Far East with 845 Naval Air Squadron, flying Grumman Avengers.
However, he resided at Shottesbrooke Park, near Maidenhead in Berkshire, the ancient home of the Vansittart family which he inherited from his father's second cousin in 1962.
After the death of the Speaker of the House of Commons, Sir Harry Hylton Foster in 1965, Smith was elected to succeed him in the subsequent by-election as Member of Parliament for the Cities of London and Westminster.
He founded the Manifold Trust in 1962, to raise money for charity by buying long leases close to the date of their expiry.
The rather speculative venture was very successful, producing a "cataract of gold" which funded many of his charitable interests, including the Landmark Trust, which he and Lady Smith founded three years later, and which still operates from their estate at Shottesbrooke.
Sir John identified and acquired properties for restoration, while Lady Smith supervised their fitting out, commissioning soft furnishings for each inspired by objects or design features associated with the buildings.