The Secret of Castle Elmshoh (German: Das Geheimnis von SchloàElmshöh) is a 1925 German silent mystery crime film directed by Max Obal and starring Ernst Reicher, Gertrud de Lalsky and Anton Walbrook. It was made at the Emelka Studios in Munich. The film's sets were designed by the art director Max Heilbronner. It is part of a long-running series featuring the detective Stuart Webbs.
After a burglary at Castle Elmshoh, the private detective Stuart Webbs is called in to investigate. Clearing up the theft turns out be relatively straightforward but in the process he uncovers a more serious crime committed in order to secure the inheritance of the estate.