John Leonard Sadler (born 19 November 1981, Dewsbury, West Yorkshire) is an English cricketer and cricket coach.
He was acting as head coach of Derbyshire until the end of the 2016 season.
As a player, Sadler played county cricket for Yorkshire, Leicestershire and Derbyshire, and also represented the Yorkshire Cricket Board.
Sadler joined the Derbyshire coaching staff in January 2014 and took over as head coach on an interim basis in June 2016, following the departure of Graeme Welch.
The club later confirmed Sadler would remain in charge for the rest of the season, with the possibility of him retaining the role on a permanent basis.Sadler has cited former Leicestershire batsman Tom New as his idol