Thomas Johnes (1 September 1748 – 23 April 1816) was a Member of Parliament, landscape architect, farmer, printer, writer and social benefactor. He is best known for his development of the Hafod Estate in Wales. Johnes was born in Ludlow, Shropshire, England. Upon moving from his family home at Croft Castle to an isolated area near Cwmystwyth, in Ceredigion, Wales, Johnes began his life works by building a church for the local tenants, a school, and magnificent gardens, walks and bridges. He undertook experiments in sheep and cattle breeding together with the growing of new crops and a thriving dairy was established. Trees were planted in great quantities on land considered unsuitable for crops; Johnes obtained the Royal Society of Arts medal five times for planting trees. He encouraged his tenants to improve their farming practices when in 1800 he published A Cardiganshire Landlord's Advice to his Tenants, with a Welsh translation and offered prizes for good crops.