Constable Studer (German: Wachtmeister Studer) is a 1939 Swiss crime film directed by Leopold Lindtberg and starring Heinrich Gretler, and Anne-Marie Blanc. The film is based on a novel by Friedrich Glauser. It was followed by a sequel Madness Rules in 1947 with Gretler reprising his role. It was shot at the Rosenhof Studios in Zurich over the summer of 1939.