The Dimension Riders is an original novel written by Daniel Blythe and based on the long-running British science fiction television series Doctor Who. It features the Seventh Doctor, Ace and Bernice. A prelude to the novel, also penned by Blythe, appeared in Doctor Who Magazine #206. This novel is the second novel in the "Alternate Universe cycle" which continues until No Future.
Like all Doctor Who spin-off media, its relationship to the ongoing story of the television series is open to interpretation.