William Ewart Astill (1 March 1888 – 10 February 1948) was, along with George Geary, the mainstay of the Leicestershire team from 1922 to about 1935. He played in nine Test matches but was never picked for a home Test or for an Ashes tour. However, for the best part of three decades he was a vital member of a generally struggling Leicestershire team. With no amateur able to play frequently for the county, Astill became the first officially appointed professional captain of any county for over fifty years in 1935. The county enjoyed a useful season, but at forty-seven years of age, Astill was only a stop gap before an amateur of the required standard and availability could be found. He was a nephew of Leicestershire fast bowler Thomas Jayes.