Murder on the Blackboard is a 1934 American pre-Code mystery/comedy film starring Edna May Oliver as schoolteacher Hildegarde Withers and James Gleason as Police Inspector Oscar Piper.

It features popular actor Bruce Cabot in one of his first post-King Kong roles, as well as Gertrude Michael, Regis Toomey, and Edgar Kennedy.

[1] Miss Withers discovers the dead body of her colleague, music teacher Louise Halloran, in a schoolroom.

She summons her old friend, Inspector Oscar Piper, but by the time he arrives, the corpse has disappeared.

She goes to the dead woman's apartment, which she had shared with her friend and school secretary, Jane Davis.

MacFarland, the womanizing head of the school, asks Withers to investigate the crime, but suspiciously suggests she leave town to check out Halloran's relatives.

Later, when Miss Withers calls to console Davis, she is disillusioned when Detective "Smiley" North answers the telephone and reveals he is having breakfast with the pretty woman.