Murder on the Blackboard

Edna May Oliver

Hildegarde Withers

James Gleason

Police Insp. Oscar Piper

Bruce Cabot

Stevens

Gertrude Michael

Jane Davis

Regis Toomey

Detective Smiley North

Edgar Kennedy

Detective Donahue

Tully Marshall

MacFarland

Jackie Searl

Leland

Frederick Vogeding

Otto (as Fredrik Vogeding)

Barbara Fritchie

Louise

Gustav von Seyffertitz

Dr. Von Immen

Tom Herbert

Detective McTeague

Jed Prouty

Dr. Levine

Wade Boteler

Bearded Diner (Uncredited)

Tommy Bupp

School Boy (uncredited)

Frank Mills

Diner Counterman (uncredited)