Edward Joshua "King" Riddiford (7 August 1842 – 2 May 1911) was a New Zealand runholder.
He was born in Hutt Valley, Wellington, New Zealand in 1842.He married Eleanor Caroline (Nellie) Bunny (1860–1938) on 3 October 1878 at St James' Church in Lower Hutt.
She was the daughter of the politician Henry Bunny.Riddiford died at Longburn of a heart attack in 1911.
He was described as New Zealand's only millionaire.He was survived by his wife, who later died when hit by a van.A grandson, Sir William O'Brien Lindsay, was Chief Justice of the Sudan.A granddaughter, Jocelyn Vogel, had Vogel House built in Lower Hutt.