
All the Weyrs of Pern is a science fiction novel by the American-Irish author Anne McCaffrey. Published in 1991, it was the eleventh book published in the Dragonriders of Pern series.

Barrayar is a science fiction novel by American writer Lois McMaster Bujold. It was first published as four installments in Analog in July–October 1991, and then published in book form by Baen Books in October 1991. Barrayar won both the Hugo Award for Best Novel and the Locus Award for Best Science Fiction Novel in 1992. It is a part of the Vorkosigan Saga, and is the seventh full-length novel of the series, in publication order. Barrayar is a direct sequel to Bujold's first novel, Shards of Honor (1986), and the two are paired in the 1996 omnibus Cordelia's Honor.

The Dark Beyond the Stars (ISBN 0-312-86624-0) is a 1991 science fiction novel by American writer Frank M. Robinson. It is a Lambda Literary Award winner, published by Orb Books. It tells the story of a generational ship and its crew on a long mission to search for extraterrestrial life in the galaxy and the complex conflict brewing within the crew and within the protagonist when the ship begins to fall apart.

Divergence (1991) is a science fiction novel by American writer Charles Sheffield, part of his Heritage Universe series. The book, the sequel to Summertide, takes place millennia in the future when most of the Orion Arm of the galaxy has been colonized by humans and other races. Among the various star systems of this arm of the galaxy, a number of million-year-old artifacts have been discovered, remnants of a mysterious race called the Builders.

Doctor Who and the Pescatons is an audio play in two episodes based on the long-running British science fiction television series Doctor Who. It is written by Victor Pemberton, and stars Tom Baker as the Fourth Doctor, Elisabeth Sladen as Sarah Jane Smith and Bill Mitchell as Zor.

Ecce and Old Earth is a 1991 science fiction novel by American writer Jack Vance, the second novel in the Cadwal Chronicles trilogy, set in Vance's Gaean Reach. It follows Araminta Station and precedes Throy.

The Exile Kiss is a cyberpunk science fiction novel by American writer George Alec Effinger, published in 1991. It is the third novel in the three-book Marîd Audran series, following the events of A Fire in the Sun. The title of the novel comes from Coriolanus, by William Shakespeare: "O! a kiss / Long as my exile, sweet as my revenge!".

The Face of the Waters is a science fiction novel by American writer Robert Silverberg, first published in 1991.

Fallen Angels (1991) is a science fiction novel by American science fiction authors Larry Niven, Jerry Pournelle, and Michael Flynn published by Jim Baen. The winner of 1992 Prometheus Award, the novel was written as a tribute to science fiction fandom, and includes many of its well-known figures, legends, and practices. It also champions modern technology and heaps scorn upon its critics - budget cutting politicians, fringe environmentalists and the forces of ignorance.

Forbidden Knowledge is a science fiction novel by American writer Stephen R. Donaldson, the second book of The Gap Cycle series.

The Garden of Rama is a 1991 novel by Gentry Lee and Arthur C. Clarke. It is the third book in the four-book Rama series: Rendezvous with Rama, Rama II, The Garden of Rama, and Rama Revealed, and follows on from where Rama II left off.

Generation Warriors is a science fiction novel by American writers Anne McCaffrey and Elizabeth Moon. published by Baen Books in 1991. It concludes the Planet Pirates trilogy (1990–1991), which McCaffrey wrote alternately with Moon and Jody Lynn Nye, and it is the last book in the Ireta series that she initiated with Dinosaur Planet in 1978.

Gojiro is the 1991 debut novel by former Esquire columnist Mark Jacobson. It reinterprets the Godzilla film series from the perspective of the daikaiju—not a fictional creature depicted on-screen via suitmation, but an irradiated varanid-turned B-movie star named Gojiro. Gojiro, a freak mutation with a cynical worldview, suffers the pain of solitude as well as several maladies experienced by entertainers, including drug abuse and suicidal tendencies. The story revolves around his adventures with human friend Komodo, a scientific genius scarred as a child by the atomic bombing of Hiroshima, as they attempt to fulfill their "Triple Ring Promise" to bring about world peace. The odyssey takes them from their home on Radioactive Island—also home to several children, called Atoms, suffering from radiation sickness—to several locations in Hollywood and the Trinity site in New Mexico.

Gridlock is a 1991 novel by Ben Elton.

Inconstant Star is a science fiction fix-up novel by American writer Poul Anderson. It is formed by the novellas Iron and Inconstant Star, first published in The Man-Kzin Wars (1988) and Man-Kzin Wars III (1990), respectively. The title is from the tumbling alien artifact that sends out radiation. Due to the tumbling effect, the output can only be seen briefly from a given point in space, looking like a star, but then disappearing as the artifact moves.

Latitude Zero is a science fiction novel by Laurence James, written under the house name James Axler. It is the twelfth book in the series of Deathlands.

Mutineers' Moon is a 1991 science fiction novel by American writer David Weber. It is the first book in his Dahak trilogy, and is available in the Baen Free Library.

Orbital Resonance is a science fiction novel by John Barnes. It is the first of four books comprising the Century Next Door series, followed by Kaleidoscope Century, Candle, The Sky So Big and Black.

Raft is a 1991 hard science fiction book by British writer Stephen Baxter. Raft is both Baxter's debut novel and the first book in the Xeelee Sequence, although the Xeelee are not present. Raft was nominated for the Arthur C. Clarke Award in 1992.

The Real Story is a science fiction novel by American writer Stephen R. Donaldson, the first book of The Gap Cycle series.

The Silent Stars Go By is a 1991 science fiction book by author James White.

Stopping at Slowyear is a 1991 science fiction novel by American writer Frederik Pohl.

The Swords of Zinjaban is a science fiction novel written by L. Sprague de Camp and Catherine Crook de Camp, the eleventh book of the former's Viagens Interplanetarias series and the eighth of its subseries of stories set on the fictional planet Krishna. Chronologically it is the eighth Krishna novel as well. It was first published in paperback by Baen Books in February 1991. An E-book edition was published by Gollancz's SF Gateway imprint on September 29, 2011 as part of a general release of de Camp's works in electronic form.

The Thanatos Syndrome (1987) was Walker Percy's last novel. It is a sequel to Love in the Ruins. Set in the near future in Feliciana, it tells the story of an imprisoned psychiatrist who is freed and returns to his town with the active members demonstrating new mysterious behaviors. He suspects that something or someone is making everyone in his town crazy and reversing them to be like primitive apes.

Timewyrm: Apocalypse is an original Doctor Who novel, published by Virgin Publishing in their New Adventures range of Doctor Who novels, and is the third volume in the Timewyrm quartet. It features the Seventh Doctor and Ace, as well as brief flashbacks and a telepathic message of the Second Doctor.

Timewyrm: Exodus is an original Doctor Who novel, published by Virgin Publishing in their New Adventures range of Doctor Who novels. It is a sequel to author Terrance Dicks' 1969 Second Doctor story The War Games as well as the second part of the ongoing four novel Timewyrm narrative.

Timewyrm: Genesys is an original Doctor Who novel, published by Virgin Publishing in their New Adventures range of Doctor Who novels. It was the first book in that series, and was thought of by some fans as a continuation of the television series; in effect, a Season 27 to follow the televised Season 26.

Timewyrm: Revelation is an original Doctor Who novel, published by Virgin Publishing in their New Adventures range of Doctor Who novels. It features the Seventh Doctor and Ace, as well as cameo appearances by the Doctor's mental representations of his first, third, fourth and fifth incarnations.

A Woman of the Iron People is an anthropological science fiction novel by American writer Eleanor Arnason, originally published in 1991. It is a first contact story between peoples from a future Earth and an intelligent, furred race of people who live on an unnamed planet far from Earth.

Xenocide (1991) is a science fiction novel by American writer Orson Scott Card, the third book in the Ender's Game series. It was nominated for both the Hugo and Locus Awards for Best Novel in 1992. The title is a combination of 'xeno-', meaning alien, and '-cide', referring to the act of killing, together meaning the act of killing populations of aliens; comparable to genocide.