John Alcock (RAF officer), captain in the Royal Navy and the Royal Air Force (d. 1919)
Captain Sir John William "Jack" Alcock (5 November 1892 – 19 December 1919) was a Royal Navy and later Royal Air Force officer who, with navigator Lieutenant Arthur Whitten Brown, piloted the first non-stop transatlantic flight from St. John's, Newfoundland to Clifden, Ireland. He died in a flying accident in France in 1919.