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.
In 1964, he proposed that boxwood cuttings from the U.S. state of Virginia be planted in the memorial park to honour John F. Kennedy then being planned for Wexford.