Sir Walter Long (c. 1594 – July 1637) was an English landowner and Member of Parliament.
He was born in Wiltshire, the son of Sir Walter Long (1565–1610) and his wife Catherine Thynne of Longleat.
According to historian John Aubrey, Long's father-in-law spent so much time at Draycot House with his daughter and her husband, that he had a gateway erected there with his own Coat of arms on it, but afterwards there was a quarrel, which probably arose from some family disapproval of the Earl's marriage with a third young wife, Jane Boteler.
The rift seems to have continued till the end of the Earl's life - in his will he 'begged pardon of the Lady Anne'.
He was supposedly 'in drink', and his son James 'almost spurred the horse to death that broke his father's neck'.