Deryck Bower Guyler was an English actor, best remembered for his portrayal of officious, short-tempered middle-aged men in sitcoms such as Please Sir! and Sykes.

Please Sir! is a British television sitcom created by John Esmonde and Bob Larbey and featuring actors John Alderton, Deryck Guyler, Penny Spencer, Joan Sanderson, Noel Howlett, Erik Chitty and Richard Davies. Produced by London Weekend Television for ITV, the series ran for 55 episodes between 1968 and 1972.