The Master Detective () is a 1933 German comedy crime film directed by Franz Seitz and starring WeiàFerdl, Ery Bos and Hans Stüwe. It was shot at the Bavaria Studios in Munich. The film's sets were designed by the art director Max Seefelder.
A snooping busybody considers himself a great investigator. When his niece acquires a new boyfriend he decides to check out his background. Unwittingly he becomes mixed up in a real crime.