Leslie Illsley was an English artist and sculptor based in West Penwith. He was one of the founders of the Troika group. Illsley is also the brother of prominentSt Ives artist Bryan Illsley.
Illsley ran Troika with Benny Sirota from 1963 until Benny left the business in 1980 and eventually it closed in 1983. Illsley's idea was to get a bit of modern art into everyone's home without them realising. In this time, Illsley along with Roland Bence designed hundreds of pieces with each sides design considered a different piece of art. This arguably made Leslie Illsley one of Britains most prolific artists.