Jim Mortimore is a British science fiction writer, who has written several spin-off novels for popular television series, principally Doctor Who, but also Farscape and Babylon 5.

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When BBC Books cancelled his Doctor Who novel Campaign, he had it published independently and gave the proceeds to a charity – the Bristol Area Down's Syndrome Association. He is also the writer of the Big Finish Doctor Who audio play The Natural History of Fear and their Tomorrow People audio play Plague of Dreams. He has also done music for other Big Finish productions.

He released his first original novel in 2011, Skaldenland.

• Lucifer Rising (1993) (with Andy Lane)
• Blood Heat (1993)
• Parasite (1994)
• Eternity Weeps (1997)
• The Sword of Forever (1998) (a Bernice Summerfield novel)
• Eye of Heaven (1998)
• Beltempest (1998)
• Campaign (2000) (published unofficially)

• The Mad Woman in the Attic (1994)
• Men Should Weep (1995)
• Brotherly Love (1996)

• Space Truckers (1996)
• Babylon 5: Clark's Law (1996, ISBN 0-440-22229-X)
• Farscape: Dark Side of the Sun (2000) – under pseudonym of Andrew Dymond
• Skaldenland (2011, Obverse Books)

• Interview with Mortimore on Outpost Gallifrey
• Downloadable PDF of Campaign
• Jim Mortimore at the Internet Speculative Fiction Database