By JJ: To assist Hugo nominators, listed below are the series believed to be eligible as of this writing for the 2019 Best Series Hugo next year *†.

Each series name is followed by the main author name(s) and the 2018-published work.

Feel free to add missing series and the name of the 2018-eligible work in the comments, and I will get them included in the main post.

I just ask that suggesters (1) first do a Find on author surname on this page, to check whether the series is already on the list, and (2) then make an effort to verify that a series does indeed have 3 volumes, that it has a 2018-published work, and that it has likely met the 240,000 word threshold; in the past I have spent a considerable amount of time trying to verify suggested series, only to discover that they had fewer than 3 volumes, or nothing published in the current year, or weren’t anything close to 240,000 words (e.g., children’s books). Self-published works may or may not be added to the list at my discretion.

Note that the 2017 Hugo Administrator ruled that nominations for a series and one of its subseries will not be combined. Therefore, when nominating a subseries work, think carefully under which series name it should be nominated. If the subseries does not yet meet the 3-volume, 240,000 word count threshold, then the main series name should be nominated. If the subseries does meet that threshold, then the subseries name should probably be nominated. This will ensure that another subseries in the same universe, or the main series itself, would still be eligible next year if this subseries is a finalist this year.

Updated: The 2019 Hugo Administrators have announced that the 2017 Best Series Finalists, although the result of a one-time category, are subject to the same re-qualification requirements as the 2018 Best Series Finalists; bear that in mind when making your nominations.

Filer discussion of the eligible series can be found in the 2019 Hugo Awards Best Series Discussion post.

* ineligible series are preceded by an asterisk

• Academy by Jack McDevitt, The Long Sunset
• Adventures of Arabella Ashby by David D. Levine, Arabella, The Traitor of Mars
• Age of Darkness by Stephen Aryan, Of Gods and Men (novella)
• Alex Verus by Benedict Jacka, Marked
• Aliens by Alex White, The Cold Forge
• Alpennia by Heather Rose Jones, “Gifts Tell Truth” (novelette)
• Alpha and Omega by Patricia Briggs, Burn Bright
• Amaranthine Spectrum by Tom Toner, The Weight of the World and The Tropic of Eternity
• Amaryllis by Carrie Vaughn, The Wild Dead (may not meet word count)
• America Rising by William C. Dietz, Battle Hymn
• Andrea Cort / Draiken by Adam-Troy Castro, Blurred Lives and A Stab of the Knife (novellas) (must be nominated under the main series, as the subseries has insufficient word count)
• Anuket City (Clocktaur Wars/Swordheart) by T. Kingfisher (Ursula Vernon), The Wonder Engine and Swordheart
• Apt Universe by Adrian Tchaikovsky, For Love of Distant Shores (collection with 3 new novellas), The Scent of Tears (anthology)
• Arcadia Project by Mishell Baker, Imposter Syndrome
• Ars Numina by Ann Aguirre, The Wolf Lord
• Assiti Shards (1632) by Eric Flint and a cast of thousands: by Paula Goodlett and Eric Flint and Gorg Huff, 1637: The Volga Rules
• Attack on Titan by Rachel Aaron, Garrison Girl
• Bel Dame Apocrypha by Kameron Hurley, Apocalypse Nyx (collection)
• *Binti by Nnedi Okorafor, Binti: The Night Masquerade (ineligible due to insufficient word count)
• Black Company by Glen Cook, Port Of Shadows
• Book of the Black Earth by Jon Sprunk, Blade and Bone
• Blood of Earth by Beth Cato, Roar of Sky
• Bound Gods by Rachel Dunne, The Shattered Sun
• Bryant & May by Christopher Fowler, Hall of Mirrors
• Cainsville by Kelley Armstrong, Rough Justice (novella)
• Celaena / Throne of Glass by Sarah J Maas, Kingdom of Ash
• Centenal Cycle by Malka Older, State Tectonics
• Chronicles of Elantra by Michelle Sagara, Cast in Deception
• Chronicles of St. Mary’s by Jodi Taylor, An Argumentation of Historians
• Claw by M. D. Lachlan, The Night Lies Bleeding
• Cobra / Cobra Rebellion by Timothy Zahn, Cobra Traitor
• Commonweal by Graydon Saunders, Under One Banner
• Confederation / Peacekeeper by Tanya Huff, The Privilege of Peace
• Conqueror’s Trilogy by Kiersten White, Bright We Burn
• Court of Thorns and Roses by Sarah J Maas, A Court of Frost and Starlight
• Custard Protocol by Gail Carriger, Competence
• Daniel Faust by Craig Schaefer, The Neon Boneyard
• Dark Alchemy by Laura Bickle, Witch Creek
• Dark Gifts by Vic James, Bright Ruin
• Demon Cycle by Peter V. Brett, Barren (novella)
• Devil’s West by Laura Anne Gilman, Red Waters Rising
• Diving Universe by Kristine Kathryn Rusch, Searching for the Fleet, and novellas The Rescue of the Renegat, Lieutenant Tightass, and Dix
• Doctor Who: by Russell T. Davies, Rose; by Jenny T Colgan, The Christmas Invasion; by Steven Moffat, The Day of the Doctor; by Paul Cornell, Twice Upon A Time
• Dorina Basarab, Dhampir by Karen Chance, Shadow’s Bane
• Draconis Memoria by Anthony Ryan, The Empire of Ashes
• Dread Empire’s Fall / Praxis by Walter Jon Williams, The Accidental War
• Earthsea by Ursula K. LeGuin, The Books of Earthsea: The Complete Illustrated Edition
• Echoes of the Fall by Adrian Tchaikovsky, The Hyena and the Hawk
• Eight Worlds by John Varley, Irontown Blues
• Elemental Masters by Mercedes Lackey, The Bartered Brides
• Ember in the Ashes by Sabaa Tahir, A Reaper at the Gates
• Ethshar by Lawrence Watt-Evans, Stone Unturned
• Every Day by David Levithan, Someday
• Extraordinary Adventures of the Athena Club by Theodora Goss, European Travel for the Monstrous Gentlewoman
• Firefly by James Lovegrove with Nancy Holder, Big Damn Hero
• Folk of the Air by Holly Black, The Cruel Prince and The Lost Sisters (novella)
• Foreigner by C.J. Cherryh, Emergence
• Forgotten Realms / Drizzt by R. A. Salvatore, Timeless
• Fractured Europe by Dave Hutchinson, Europe at Dawn
• Frontlines by Marko Kloos, Points of Impact
• Gaia Chronicles by Naomi Foyle, Stained Light
• Gates of the World by K.M. McKinley, The Brass God
• Gods & Monsters / Rupert Wong by Cassandra Khaw, Food of the Gods and Rupert Wong and the Ends of the Earth (novella)
• Godserfs by N.S. Dolkart, A Breach in the Heavens
• Goredd / Seraphina by Rachel Hartman, Tess of the Road
• Great Library by Rachel Caine, Smoke and Iron
• Green Rider by Kristen Britain, The Dream Gatherer
• Guild Hunter by Nalini Singh, Archangel’s Prophecy
• *Haden Universe by John Scalzi, Head On (ineligible due to insufficient word count, per author’s statement)
• Hail Bristol / Farian War by K. B. Wagers, There Before the Chaos (must be nominated under the main series, as the subseries has insufficient word count and/or volumes)
• Halcyone Space by L.J. Cohen, A Star in the Void
• Harry Potter / Fantastic Beasts by J.K. Rowling, The Crimes of Grindelwald (must be nominated under the main series, as the subseries has insufficient word count and/or volumes)
• Heirs of Alexandria by Eric Flint and Dave Freer, All the Plagues of Hell
• Hell Divers by Nicholas Sansbury Smith, Deliverance
• Heroine Complex by Sarah Kuhn, Heroine’s Journey
• Honorverse / Manticore Ascendant by David Weber, Uncompromising Honor, Timothy Zahn and Thomas Pope, A Call to Vengeance
• Illuminae Files by Amie Kaufman and Jay Kristoff, Obsidio
• Imperials by Melinda Snodgrass, The Hidden World
• In Death by J.D. Robb, Dark in Death and Leverage in Death
• *InCryptid by Seanan McGuire, Tricks for Free (ineligible due to being a finalist in 2018 and having insufficient new word count and/or volumes to requalify)
• Innsmouth Legacy by Ruthanna Emrys, Deep Roots
• Invisible Library by Genevieve Cogman, The Mortal Word
• Iron Druid Chronicles by Kevin Hearne, Scourged
• Ishmael Jones by Simon R. Green, Murder in the Dark
• Jake Ross by Ben Bova, Power Failure
• Jane Hawk by Dean Koontz, The Crooked Staircase
• Jane Yellowrock by Faith Hunter, Dark Queen
• Jerry Cornelius by Michael Moorcock, Pegging the President
• Kate Daniels by Ilona Andrews (Ilona and Gordon Andrews), Magic Triumphs
• Kitty Katt by Gini Koch, Aliens Abroad
• Kris Longknife by Mike Shepherd, Commanding
• Kylara Vatta / Vatta’s Peace by Elizabeth Moon, Into the Fire (must be nominated under the main series, as the subseries has insufficient word count and/or volumes)
• *Lady Astronaut by Mary Robinette Kowal, The Calculating Stars and The Fated Sky (ineligible due to insufficient word count at 238,581 words)
• Lady Helen by Alison Goodman, The Dark Days Deceit
• Laundry Files by Charles Stross, The Labyrinth Index
• Legends of the First Empire by Michael J. Sullivan, Age of War
• *Legion by Brandon Sanderson, Lies of the Beholder (novella) (ineligible due to insufficient word count)
• Liaden Universe by Sharon Lee and Steve Miller, Neogenesis
• Lord of the Rings by J.R.R. Tolkien, The Fall of Gondolin
• Machineries of Empire by Yoon Ha Lee, Revenant Gun
• Magic ex Libris by Jim C. Hines, “Imprinted” (novelette)
• Majestic-12 / MJ-12 by Michael J. Martinez, Endgame
• Maradaine / Streets of Mardaine / Maradaine Elite by Marshall Ryan Maresca, Lady Henterman’s Wardrobe and The Way of the Shield (must be nominated under the main series, as the subseries have insufficient word counts and/or volumes)
• Merchant Princes / Empire Games by Charles Stross, Dark State (must be nominated under the main series, as the subseries has insufficient word count and/or volumes)
• Miriam Black by Chuck Wendig, The Raptor & The Wren
• Miss Peregrine’s Peculiar Children by Ransom Riggs, A Map of Days
• Monster Hunter International / Monster Hunter Memoirs by Larry Correia and John Ringo, Saints
• Mortal Engines / Hungry City by Philip Reeve, Night Flights (collection)
• Motherless Children by Glen Hirshberg, Nothing to Devour
• *Murderbot Diaries by Martha Wells, Artificial Condition and Rogue Protocol (ineligible due to insufficient word count)
• Nick Medea by Richard A. Knaak, Black City Dragon
• Nightshades by Melissa F. Olson, Outbreak
• Nightside by Simon R. Green, Night Fall (this novel ends both the Nightside and Secret History series)
• October Daye by Seanan McGuire, Night and Silence and Suffer a Sea-Change (novella)
• Odyssey One by Evan Currie, Odysseus Ascendant
• Olympus Bound by Jordanna Max Brodsky, Olympus Bound
• Others by Anne Bishop, Lake Silence
• PERN by Anne McCaffrey and Gigi McCaffrey, Dragon’s Code
• Planetfall by Emma Newman, Before Mars
• Point / Astreiant by Melissa Scott, Point of Sighs
• Polity / Rise of the Jain by Neal Asher, The Soldier (must be nominated under the main series, as the subseries has insufficient word count and/ or volumes)
• Powder Mage / Gods of Blood and Powder by Brian McClellan, Wrath of Empire (must be nominated under the main series, as the subseries has insufficient word count and/ or volumes)
• Queens of Renthia by Sarah Beth Durst, Queen of Sorrow
• Railhead by Philip Reeve, Station Zero
• Ray Electromatic by Adam Christopher, I Only Killed Him Once
• Rebel of the Sands by Alwyn Hamilton, Hero at the Fall
• Red Rising by Pierce Brown, Iron Gold
• Revelation Space by Alastair Reynolds, Elysium Fire
• *Rivers of London / Peter Grant by Ben Aaronovitch, Lies Sleeping (ineligible due to being a finalist in 2017 and having insufficient new word count and/or volumes to requalify)
• Rowankind by Jacey Bedford, Rowankind
• Saga of Recluce by L.E. Modesitt, Outcasts of Order 
• Sandman Slim by Richard Kadrey, Hollywood Dead
• Secret History by Simon R. Green, Night Fall (this novel ends both the Nightside and Secret History series)
• Shadow by Lila Bowen (aka Delilah S. Dawson), Treason of Hawks
• Shadow Campaigns by Django Wexler, The Infernal Battalion
• Shannara by Terry Brooks, The Skaar Invasion
• Sin du Jour by Matt Wallace, Taste of Wrath (novellas) (series contains 7 novellas and 1 novelette; author has verifed that it meets the word count)
• Song of Ice and Fire by George R.R. Martin, Fire and Blood
• Song of Shattered Sands by Bradley P. Beaulieu, A Veil of Spears
• Star Trek: Discovery: by Dayton Ward, Drastic Measures; by James Swallow, Fear Itself
• Star Trek: The Next Generation by Dayton Ward, Available Light
• Star Trek: The Original Series by David A. Goodman, The Autobiography of Mr. Spock
• Star Trek: Prometheus by Bernd Perplies and Christian Humberg, The Root of All Rage and In the Heart of Chaos
• Star Trek: Voyager by Kirsten Beyer, Architects of Infinity
• Star Wars: by Jason Fry, The Last Jedi; by Daniel José Older, Last Shot; by E.K. Johnston, Queen’s Shadow; by Rae Carson, Solo: Most Wanted; by Mur Lafferty, Solo: A Star Wars Story
• Star Wars: Thrawn by Timothy Zahn, Thrawn: Alliances
• *Starfire (Tor.com) by Spencer Ellsworth, Memory’s Blade (ineligible due to insufficient word count)
• Starfire (Baen) by David Weber, Steve White, Shirley Meier, and Charles E. Gannon, Oblivion
• *Sunflowers by Peter Watts, The Freeze-Frame Revolution (novella) (ineligible due to insufficient word count)
• Sword of Truth / Nicci Chronicles by Terry Goodkind, Shroud of Eternity and Siege of Stone
• Tale of the Five by Diane Duane, The Levin-Gad (novella)
• Tau Ceti Agenda by Travis S. Taylor, Bringers of Hell
• *Tensorate by JY Yang, The Descent of Monsters (ineligible due to insufficient word count)
• Themis Files by Sylvain Neuvel, Only Human
• Three Dark Crowns by Kendare Blake, Two Dark Reigns
• Tortall Universe / Numair Chronicles by Tamora Pierce, Tempests and Slaughter (must be nominated under the main series, as the subseries has insufficient word count and/ or volumes)
• Tufa by Alex Bledsoe, The Fairies of Sadieville
• Valdemar by Mercedes Lackey, The Hills Have Spies and Choices (anthology)
• Uglies / Impostors by Scott Westerfeld, Impostors (must be nominated under the main series, as the subseries has insufficient word count and/or volumes)
• Vampire Chronicles by Anne Rice, Blood Communion
• Verity Fassbinder by Angela Slatter, Restoration
• *Villains by V.E. Schwab, Vengeful (probably ineligible due to insufficient word count)
• *Voidwitch Saga by Corey J. White, Static Ruin (ineligible due to insufficient word count)
• *Vorkosigan Saga by Lois McMaster Bujold, The Flowers of Vashnoi (novella)(permanently ineligible due to being the winner of the Series award in 2017)
• Warhammer 40K / The Horus Heresy by a cast of gazillions, Ruinstorm, Fulgrim, Ferrus Manus, Jaghatai Khan, Wolfsbane, and Slaves to Darkness
• Wayfarers by Becky Chambers, Record of a Spaceborn Few
• *Wayward Children by Seanan McGuire, Beneath the Sugar Sky (ineligible due to insufficient word count)
• Web Shifters by Julie E. Czerneda, Search Image and The Only Thing to Fear (novella)
• Wild Cards by George R.R. Martin and a cast of thousands, Texas Hold ‘Em; edited by Melinda Snodgrass, Low Chicago (anthology); by Bradley Denton and Caroline Spector, The Flight of Morpho Girl (novella)
• The Wounded Kingdom by RJ Barker, King of Assassins
• Xeelee Sequence by Stephen Baxter, Xeelee: Redemption
• Xuya Universe by Aliette de Bodard, The Tea Master and the Detective (novella) (series consists of 25 short fiction works, including 3 novellas; author has verifed that it meets the word count)
• Yesterday’s Kin by Nancy Kress, If Tomorrow Comes and Terran Tomorrow
• Zeros by Scott Westerfied, Margo Lanagan, and Deborah Biancotti, Nexus

* no warranties are made about series eligibility (or lack thereof) based on word count

† no warranties are made about the presumed quality (or lack thereof) of listed series