John "Jack" Elliott (also spelled Jack Elliot) (13 August 1871 – 30 March 1938) was a Welsh rugby union scrum-half who played club rugby for Cardiff and international rugby for Wales, winning three caps.
Although born in the North-East of England, Elliott was living in Cardiff, the Welsh capital by the time he was a young man.
He became the director of the Mountstuart Dry Dock at Cardiff Docks and was a property owner.