Frankenstein's monster or Frankenstein's creature, often referred to as simply "Frankenstein", is a fictional character who first appeared in Mary Shelley's 1818 novel Frankenstein; or, The Modern Prometheus as the main antagonist.

Whether or not Mary was influenced by Dippel's story, the premise for Frankenstein seems to have been lurking in her subconscience. In her 1831 preface to the novel, she attributed her inspiration to a nightmare she had at Geneva, where the company spent their evenings terrifying each other with chilling stories.