Thomas Span Plunket, 2nd Baron Plunket (1792–1866), was Bishop of Tuam, Killaly and Achonry. Plunket was the first son of William Plunket, 1st Baron Plunket and his wife, Catherine (née McCausland). He was educated at St John's College, Cambridge. He served as Dean of Down from 1831 to 1839 before being elevated to the episcopacy as Bishop of Tuam, Killala and Achonry in 1839, a position he held until his death in 1866. He moved to live on a private estate at Tourmakeady, where he evicted many Catholic families for not sending their children to the Protestant school. In 1852 he built a Protestant church in the vicinity.