Farewell, Nikola is a 1901 novel by Australian author Guy Boothby, marking the fifth and final installment in the Doctor Nikola series. The story follows Richard Hatteras, his wife, and their friend Gertrude Trevor as they visit Venice, where they encounter the enigmatic Doctor Nikola, a villain from Hatteras's past. The novel explores themes of morality and character through their interactions, set against the atmospheric backdrop of Venice. It was also serialized under the title Nikola's Farewell in several Australian newspapers in the same year.
