George Trenchard (c. 1684–1758), of Lytchett Matravers, near Poole, Dorset, was a British landowner and Whig politician who sat in the House of Commons for 35 years between 1713 and 1754.
Trenchard was returned as Member of Parliament for Poole on his own interest at the 1713 British general election.
His only known speech was, in the committee on the South Sea sufferers bill, on 2 June 1721, when he moved that Sir Theodore Janssen be allowed to keep £50,000 from his estate.
At the 1741 British general election he chose to stand with Thomas Wyndham, but it turned out that the Corporation were not prepared to support them, and he did not proceed to the poll.
He was returned again unopposed at the 1747 British general election with a different running mate.. Before the 1754 British general election he gave his interest at Poole to Sir Richard Lyttelton, on condition that his son John Trenchard should be made a commissioner of taxes.