John Jones "of Ystrad" (1777–1842), was a Welsh politician, MP for Carmarthen from 1821 to 1832.
He was born on 15 September 1777 in King Street, Carmarthen, the son of Thomas Jones, a solicitor of Job's Wells and Capel Dewi, Carmarthen and of Anna Maria, daughter of John Jones of Crynfryn, Cardiganshire.[1] Jones was educated at Eton College and Christ Church, Oxford, he went on to Lincoln's Inn to qualify as a barrister. His work on the South Wales circuit took him back to his home area.