The Mad Doctor is a 1941 American crime thriller film directed by Tim Whelan and starring Basil Rathbone as a physician whose successive wealthy wives die.

The doctor's loyal male assistant (Martin Kosleck) tampers with the victims buried bodies in order to hide the incriminating evidence.

The ex-fiancé of the doctor's latest bride (Ellen Drew) is able to save her from suffering the same fate of her predecessors, while also informing the authorities of just how the women died.

Green for the screenplay, but early drafts titled The Monster and Destiny were written by Ben Hecht and Charles MacArthur.

[1] The Hollywood Reporter called the film "one of the top efforts of its type", which it attributed to the "beautifully imaginative direction of Tim Whelan and the stunning performance of Basil Rathbone".