Baron Leigh has been created twice as a hereditary title, once in the Peerage of England and once in the Peerage of the United Kingdom. The first creation came in the Peerage of England 1643 when Sir Thomas Leigh, 2nd Baronet, was created Baron Leigh, of Stoneleigh in the County of Warwick. The Leigh Baronetcy, of Stoneleigh in the County of Warwick, had been created in 1611 for his grandfather and namesake Thomas Leigh. The latter was the second son of Sir Thomas Leigh (d. 1571), Lord Mayor of London in 1558, whose third son Sir William Leigh was the grandfather of Francis Leigh, 1st Earl of Chichester. The titles became extinct on the death of the fifth Baron Leigh in 1786.