Thaddeus Lynch (1901 – 25 October 1966) was an Irish Fine Gael politician and auctioneer. He first stood for election at the 1952 Waterford by-election but was unsuccessful. He was first elected as a Fine Gael Teachta Dála (TD) for the Waterford constituency at the 1954 general election. He was re-elected at each subsequent general election until his death in 1966. The by-election caused by his death was won by Fad Browne of Fianna Fáil.