Colonel Thomas Horton, January 1603 to October 1649, was a member of the minor gentry from Leicestershire who served in the Parliamentarian army during the Wars of the Three Kingdoms. A regicide who approved the Execution of Charles I in January 1649, Horton was also a religious Independent who later became a Baptist. His family was closely connected to Sir Arthur Haselrig, one of the Five Members whose attempted arrest by Charles I in January 1642 was a major step on the road to the First English Civil War.