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.

The theme tune "School's Out" was by Sam Fonteyn.

The title derives from the then-standard request phrase used in Britain when they wish to interrupt the teacher with a question.

Although the series is based around a class of 16-year-old pupils, most of the actors in these roles were in their twenties.