Sir Thomas Grantham (1573 – 30 July 1630) was an English politician who sat in the House of Commons from 1604 to 1629.
He matriculated at Christ Church, Oxford on 9 May 1589, aged 16, and was a student of Lincoln's Inn in 1592 .
He was High Sheriff of Lincolnshire in 1600 and was knighted at Belvoir Castle on 23 April 1603.
[1] In 1604 and 1614, Grantham was elected Member of Parliament for Lincoln and for Lincolnshire in 1621 and 1624.
He was elected MP for Lincoln again in 1625, 1626 and 1628 when he sat until 1629, after which time King Charles I decided to rule without parliament for eleven years.