The Red Pen is a two-act operetta and early radio opera composed by Geoffrey Toye to a libretto by A. P. Herbert. The piece, described by its creators as "a sort of opera" was written for the BBC, following Herbert's successful Riverside Nights, and had a running time of about 90 minutes.[1] It was first broadcast on the radio on 24 March 1925.[2] It was broadcast again in 1927.[1]