The 2023 finalists for the Best Series Hugo are:

• Children of Time Series, by Adrian Tchaikovsky (Pan Macmillan/Orbit)
• The Founders Trilogy, by Robert Jackson Bennett (Del Rey)
• The Scholomance, by Naomi Novik (Del Rey)
• The Locked Tomb, by Tamsyn Muir (Tordotcom)
• Rivers of London, by Ben Aaronovich (Orion)
• October Daye, by Seanan McGuire (DAW)

In previous years there were requests for a list of the works considered part of each finalist for Best Series (whether or not those works are included in the voter packet). Since the voter packet doesn’t include one, File 770 reader Joseph came up with this unofficial list of works included in each series.

Three of the series are straightforward, in that they just have novels and not any separately published short fiction to consider.

CHILDREN OF TIME SERIES

Children of Time
Children of Ruin
Children of Memory

THE FOUNDERS TRILOGY

Foundryside
Shorefall
Locklands

THE SCHOLOMANCE

A Deadly Education
The Last Graduate
The Golden Enclaves

THE LOCKED TOMB

The Locked Tomb has three novels and two pieces of short fiction (so far):

Gideon the Ninth
Harrow the Ninth
Nona the Ninth

“The Mysterious Study of Doctor Sex” at Tor.com
“As Yet Unsent” at Tor.com

RIVERS OF LONDON

Rivers of London includes nine novels (these are what’s in the voter packet), three novellas (a fourth published in 2023), thirteen pieces of short fiction (collected in Tales from the Folly), and graphic novels (it’s less clear if those count as part of the nomination for the purposes of the rules on Best Series, which specify “works in which the text is the primary form of communication”).

Novels
Rivers of London
Moon over Soho
Whispers Under Ground
Broken Homes
Foxglove Summer
The Hanging Tree
Lies Sleeping
False Value
Amongst Our Weapons

Novellas
The Furthest Station
The October Man
What Abigail Did That Summer

The Wikipedia article Rivers of London (book series) provides an (incomplete) list in internal chronological order, including short fiction and graphic novels.

OCTOBER DAYE

October Daye includes 16 novels and 48 pieces of short fiction published up to the end of 2022 (the voter packet provides NetGalley access to the novels). 

The Wikipedia’s Seanan McGuire bibliography gives lists in publication order. Seanan McGuire has also been posting a list in internal chronological order, including the short fiction (with brief comments and content warnings), on Twitter (starting here) and Bluesky; not sure why the short fiction didn’t end up in the voter packet, given the intent expressed there to include it; it was included in the 2021 voter packet. Neither platform makes it easy to read things without an account at present; see https://twstalker.com/seananmcguire/status/1677027195632619524 or https://blue.amazingca.dev/user/seananmcguire.bsky.social for versions of the thread that can currently be read without an account. I think the following is the internal chronological order for all 64 stories (starting off based on Seanan’s list, followed by my understanding of the order for the remaining stories) – though it’s probably best to read several of the novels before many of the pieces of prequel short fiction that come earlier chronologically:

“Such Dangerous Seas”
“The Fixed Stars”
“Sun Sets Weeping”
“Rat-Catcher”
“Forbid the Sea”
“Stage of Fools”
“The Voice of Lions”
“The Act of Hares”
“Instruments of Darkness”
“With Honest Trifles”
“In Deepest Consequence”
“Jealous In Honor”
“Quick in Quarrel”
“Of Strange Oaths”
“Dreams and Sighs”
“Wishes and Tears”
“Poor Fancy’s Followers”
“Our Trial Patience”
“Earth for Charity”
“Mean and Mighty”
(“Distinction of Place” and “Notes of Sorrow” were released 2023, so not part of the nomination.)
“In Little Stars” (missing in Seanan’s list)
“Heaps of Pearl”
“Shore to Shore”
“Write in Water”
“Live in Brass”
“And Thrice Again”
“The Ambitious Ocean”
“Shine in Pearl”
“These Antique Fables”
“Never Shines the Sun”
“In Sea-Salt Tears”
“Strangers in Court”
Rosemary and Rue
A Local Habitation
An Artificial Night
Late Eclipses
“Through This House”
One Salt Sea
Ashes of Honor
“No Sooner Met”
Chimes at Midnight
“Full of Briars”
The Winter Long
A Red-Rose Chain
Once Broken Faith
“Dreams and Slumbers”
The Brightest Fell
“Of Things Unknown”
Night and Silence
“Suffer a Sea-Change”
The Unkindest Tide
“Hope is Swift”
A Killing Frost
“And Deeps Below”
“Sacrifice Your Tears”
“Into the Sea”
“In Safety Rest”
“Upon Your Honor”
“With Sweet Peace”
“Like a Dream”
“Give Sorrow Words”
When Sorrows Come
“And With Reveling”
Be the Serpent