Sir Walter Butler, 1st Baronet (died 1650) was an Irish nobleman.
He was created a baronet, of Polestown, in the Baronetage of Ireland on 8 July 1645.
They had issue Sir Richard Butler, 2nd Baronet Polestown (d. c. 1679).
He held the office of Governor of Kilkenny on 28 March 1650, when it surrendered to Cromwell.
Polestown, also known as Poulstown, is today called Paulstown and is located in County Kilkenny.