Sir Thomas Trenchard (1582 – 1657) was an English politician who sat in the House of Commons at various times between 1621 and 1648.
Trenchard was the son of Sir George Trenchard of Warmwell and his wife Ann Speke daughter of Sir George Speke of Whitelackington.
In 1645, he was re-elected MP for Dorset for the Long Parliament and sat until 1648 when he was excluded under Pride's Purge.
[4] He commanded a regiment of the Dorset Trained Bands at the Siege of Sherborne at the beginning of the First English Civil War.
[1] He had a son Thomas who was the father of John Trenchard Secretary of State.