S.F. Masterworks is a series of science fiction novel reprints published by UK-based company Orion Publishing Group, a subsidiary of Hachette UK. The series is intended for the UK and Australian markets, but many editions are distributed to the United States and Canada by Hachette Book Group. , 199 unique titles and approximately 308 volumes, including hardcover, revised, or reprinted editions, have been published.

Superseding the earlier series Gollancz Classic SF (1986–1987) and VGSF Classics (1988–1990), the SF Masterworks series began publication in 1999. Developed to feature important and out of print science fiction novels, the selections were described by science fiction author Iain M. Banks as "amazing" and "genuinely the best novels from sixty years of SF". Many of the selections had been out of print in the United Kingdom for several years.

Its companion series include Fantasy Masterworks and Gateway Essentials.

Numbered series Softcover editions (1999–2007) Not all printings include a number stamp. Some printings do not include markings or cover designs to indicate they are volumes of any series.

In 2010, several volumes were reprinted with cover designs and colored spines matching the relaunch series. The ISBNs for those volumes were not changed.

TitleAuthor(s)Reprint dateISBN1The Forever WarJoe Haldeman21 January 19992I Am LegendRichard Matheson3Cities in FlightJames Blish11 February 19994Do Androids Dream of Electric Sheep?Philip K. Dick5The Stars My DestinationAlfred Bester11 March 19996Babel-17Samuel R. Delany7Lord of LightRoger Zelazny8 April 19998The Fifth Head of CerberusGene Wolfe9GatewayFrederik Pohl13 May 199910The Rediscovery of ManCordwainer Smith11Last and First MenOlaf Stapledon10 June 199912Earth AbidesGeorge R. Stewart13Martian Time-SlipPhilip K. Dick8 July 199914The Demolished Man ^Alfred Bester15Stand on ZanzibarJohn Brunner12 August 199916The DispossessedUrsula K. Le Guin17The Drowned World ^J. G. Ballard9 September 199918The Sirens of Titan ^Kurt Vonnegut19EmphyrioJack Vance14 October 199920A Scanner DarklyPhilip K. Dick21Star MakerOlaf Stapledon11 November 199922Behold the Man ^Michael Moorcock23The Book of SkullsRobert Silverberg16 December 199924The Time Machineand The War of the WorldsH. G. Wells25Flowers for AlgernonDaniel Keyes13 January 200026UbikPhilip K. Dick10 February 200027TimescapeGregory Benford9 March 200028More Than HumanTheodore Sturgeon13 April 200029Man Plus ^Frederik Pohl11 May 200030A Case of ConscienceJames Blish15 June 200031The Centauri DeviceM. John Harrison13 July 200032Dr. BloodmoneyPhilip K. Dick10 August 200033Non-StopBrian Aldiss14 November 200034The Fountains of ParadiseArthur C. Clarke12 October 200035PavaneKeith Roberts9 November 200036Now Wait for Last Year ^Philip K. Dick4 December 200037NovaSamuel R. Delany11 January 200138The First Men in the MoonH. G. Wells8 February 200139The City and the StarsArthur C. Clarke8 March 200140Blood MusicGreg Bear12 April 200141JemFrederik Pohl10 May 200142Bring the JubileeWard Moore14 June 200143VALISPhilip K. Dick12 July 200144The Lathe of HeavenUrsula K. Le Guin9 August 200145The Complete RoderickJohn Sladek12 October 200146Flow My Tears, the Policeman SaidPhilip K. Dick8 November 200147The Invisible ManH. G. Wells6 December 200148GrassSheri S. Tepper14 February 200249A Fall of MoondustArthur C. Clarke14 March 200250EonGreg Bear11 April 200251The Shrinking ManRichard Matheson9 January 200352The Three Stigmata of Palmer EldritchPhilip K. Dick31 July 200853The Dancers at the End of Time ^Michael Moorcock8 May 200354The Space Merchants ^Frederik Pohl and Cyril M. Kornbluth10 July 200355Time Out of JointPhilip K. Dick11 September 200356Downward to the EarthRobert Silverberg12 February 200457The SimulacraPhilip K. Dick9 September 200458The Penultimate Truth10 February 200559Dying InsideRobert Silverberg14 April 200560RingworldLarry Niven9 June 200561The Child GardenGeoff Ryman11 August 200562Mission of GravityHal Clement13 October 200563A Maze of DeathPhilip K. Dick1 December 200564Tau ZeroPoul Anderson9 February 200665Rendezvous with RamaArthur C. Clarke13 April 200666Life During WartimeLucius Shepard8 June 200667Where Late the Sweet Birds SangKate Wilhelm12 October 200668Roadside PicnicArkady and Boris Strugatsky8 February 200769Dark BenedictionWalter M. Miller Jr.12 April 200770MockingbirdWalter Tevis14 June 200771Dune †Frank Herbert18 October 200772The Moon Is a Harsh Mistress †^Robert A. Heinlein11 December 200873The Man in the High Castle †Philip K. Dick17 September 2009

Hardcover editions (2001) Not all printings include a number stamp. Some printings do not include markings or cover designs to indicate they are volumes of any series. TitleAuthor(s)Reprint dateISBN1DuneFrank Herbert25 October 20012The Left Hand of DarknessUrsula K. Le Guin18 October 20013The Man in the High CastlePhilip K. Dick4The Stars My DestinationAlfred Bester5A Canticle for LeibowitzWalter M. Miller Jr.6Childhood's EndArthur C. Clarke7The Moon Is a Harsh MistressRobert A. Heinlein8RingworldLarry Niven9The Forever WarJoe Haldeman10The Day of the TriffidsJohn Wyndham

Relaunch series

Softcover editions (2010–present) The relaunched series features yellow–white spines, the S.F. Masterworks marquee printed vertically atop tinted artwork, and newly typeset and corrected text. As with the numbered volumes, many printings, that have identical ISBNs, do not include markings or cover designs to indicate they are volumes of any series.