The Hugo Award for Best Series is one of the Hugo Awards given each year for science fiction or fantasy stories published in or translated into English during the previous calendar year. The award is available for series of science fiction or fantasy stories consisting of at least 3 published works totaling at least 240,000 words, with at least one work released or translated into English during the previous calendar year. A losing finalist becomes eligible again with the publication of at least two new works totaling at least 240,000 words.

The Hugo Award for Best Series has been awarded annually since 2017. It was first presented in that year as a one-time special Hugo Award in advance of a vote to make it a permanent category, and was ratified as such by members of the World Science Fiction Society that year. An earlier series award was given to Isaac Asimov for his Foundation series in 1966 for Best All-Time Series. In addition to the regular Hugo Awards, between 1996 and 2025 Retrospective Hugo Awards or "Retro-Hugos" were available for works published 50, 75, or 100 years prior. Retro-Hugos could only be awarded for years after 1939 in which no awards were originally given. A Retro-Hugo Award was given for the series category once, in 2020, representing what could have been awarded in 1945.

Hugo Award nominees and winners are chosen by supporting or attending members of the annual World Science Fiction Convention, or Worldcon, and the presentation evening constitutes its central event. The selection process is defined in the World Science Fiction Society Constitution as instant-runoff voting with six finalists. The series on the ballot are the six most-nominated by members that year, with no limit on the number of series that can be nominated. Initial nominations of five series each are made by members in January through March, while voting on the ballot of six finalists is performed roughly in April through July, subject to change depending on when that year's Worldcon is held. Worldcons are generally held near the start of September, and are held in a different city around the world each year.

In the 11 nomination years, 54 series by 46 authors have been finalists, including co-authors and Retro-Hugos. Lois McMaster Bujold is the only author to win twice, for the Vorkosigan Saga and World of the Five Gods series. 13 other authors have received multiple final ballot nominations, with Seanan McGuire and Adrian Tchaikovsky nominated for three different series; Robert Jackson Bennett, Max Gladstone, Naomi Novik, John Scalzi, Charles Stross, and Martha Wells being nominated for two; and Ben Aaronovitch, Aliette de Bodard, Brandon Sanderson, and James S. A. Corey (a pen-name for Daniel Abraham and Ty Franck) nominated multiple times for the same series. McGuire has the most nominations overall with ten, winning once.

Winners and finalists In the following table, the years correspond to the date of the ceremony, rather than when any work in the series was published. Entries with a yellow background have won the award; those with a grey background are the other finalists.

  *   Winners and joint winners

+ YearAuthorSeriesPublisher(s) 2017 * Baen Books Tor Books (pen name of Daniel Abraham and Ty Franck) Orbit Books DAW Books / Corsair Books Victor Gollancz Ltd / Del Rey Books / DAW Books / Subterranean Press Del Rey Books / Harper Voyager UK 2018 * World of the Five Gods Harper Voyager / Spectrum Literary Agency Night Shade Books Broadway Books InCryptid DAW Books Tor Books / Titan Books Tor Books / Victor Gollancz Ltd 2019 * Wayfarers Hodder & Stoughton / Harper Voyager Tor.com Publishing Tor.com Publishing / Orbit Books Machineries of Empire Solaris Books DAW Books Subterranean Press 2020 (pen name of Daniel Abraham and Ty Franck)* Orbit Books InCryptid DAW Books Luna Tor Books / Victor Gollancz Ltd Planetfall series Ace Books / Victor Gollancz Ltd Winternight Trilogy Del Rey Books Orbit Books 2021 * Tor.com Publishing Harper Voyager Tor Books Tor Books / Audible / The Magazine of Fantasy & Science Fiction DAW Books Harper Voyager 2022 * Wayward Children Tordotcom Publishing Orbit Books Tordotcom Publishing Macmillan Publishers Terra Ignota Tor Books Argyll Productions 2023 * Children of Time series Pan Macmillan/Orbit Books Del Rey Books Tordotcom October Daye DAW Books Orion Publishing Group Del Rey Books 2024 * Imperial Radch Orbit Books The Final Architecture Tordotcom / Orbit Books Tordotcom / Tor Books Tordotcom / Orbit Books October Daye DAW Books Victor Gollancz Ltd / JABberwocky Literary Agency / Subterranean Press / Uncanny Magazine / et al.) 2025 * Between Earth and Sky Saga Press Tordotcom / Orbit Books InCryptid DAW Books Southern Reach Farrar, Straus and Giroux Tor Books Ad Astra 2026 * Old Man's War Tor Books Emily Wilde Del Rey Books / Orbit Books October Daye Tordotcom / DAW Books Tor Books / Subterranean Press Tordotcom White Space Saga Press / Victor Gollancz Ltd

Retro-Hugos Between the 1996 Worldcon and 2025 Worldcon, the World Science Fiction Society had the concept of "Retro-Hugos", in which the Hugo award could be retroactively awarded for 50, 75, or 100 years prior. Retro-Hugos could only be awarded for years after 1939 (the year of the first Worldcon) in which no Hugos were originally awarded. Retro-Hugos were awarded eight times, for 1939, 1941, 1943–1946, 1951, and 1954, though only once for series. Retro-Hugos for series do not note the original publishers.

+ YearYear awardedAuthor(s)Series 1945 2020 * et al.* (as Brett Sterling) Captain Future Doc Savage Jules de Grandin Pellucidar (as Maxwell Grant) The Shadow

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