Paul Leni was a German filmmaker and a key figure in German Expressionism, making Hintertreppe (1921) and Waxworks (1924) in Germany, and The Cat and the Canary (1927), The Chinese Parrot (1927), The Man Who Laughs (1928), and The Last Warning (1928) in the United States.

The Last Warning is a 1928 sound part-talkie American mystery film directed by Paul Leni, and starring Laura La Plante, Montagu Love, and Margaret Livingston. In addition to sequences with audible dialogue or talking sequences, the film features a synchronized musical score and sound effects along with English intertitles. The film apparently only survives in a cut-down edited silent version which was made for theaters that had not yet converted to sound. The soundtrack for the sound version, which was also released on sound-on-disc format, survives in private hands on Vitaphone type discs.