Part of the Kyralia Series.

This is a series of books featuring collections of short stories that originally featured in magazines.

by William Gibson

A series of science fiction books by Dennis E Taylor.

A series of Christian Fiction books featuring Wolfe Boone.

A fantasy series by Mark Lawrence.

A series of novels by Gene Wolfe that takes place after Book of the New Sun.

Book of the New Sun is a science fiction series by Gene Wolfe.

A series of novels by Gene Wolfe that takes place after Book of the Long Sun.

A series by N K Jemisin

A "series" of comedic sci-fi - based on the movie - by Earl Mac Rauch.

A series of novels based on the television series Buffy the Vampire Slayer.  This series is aimed more toward the young adult audience.

A series of novels based on the television series Buffy the Vampire Slayer.  This series is aimed toward the adult audience.

A series of supernatural fantasy from the Author Amber Benson, also known from Buffy The Vampire Slayer.

Set in the Star Wars universe set 12 ABY.  This is an unofficial series comprising three related stand-alone Star Wars novels.

A "series" related to Carnival Row.

A series of books outlines cases for certain beliefs in Christianity by Lee Strobel.

A series of books about a land that time forgot.

A part of the Harry Bosch world by Michael Connelly.

A series of modern fantasy books targeted to teen and young adults by Kami Garcia and Margaret Stohl.

A series of graphic novels reprinting the Cerebus comic books written by David Sim and illustated by Dave Sim and Gerard.  All issues are reprinted except for 51, 112, 113, 137 and 138 which were reprinted in Cerebus Number Zero..

A trilogy of books by Lois McMaster Bujold that began the World of the Five Gods.

A series of books written by C J Cherryh that takes place in the Alliance-Union Universe.

Series of fantasy novels by Raymond E Feist.  A subset of the Riftwar Cycle.

The Childe Cycle is an unfinished science fiction series by Gordon R Dickson.

A series within the Deryni world.

A series of science fiction novels by Adrian Tchaikovsky.

A series of children's books by the creator of Jame Bond - Ian Fleming

A sub-series of science fiction novels taking place in the Commonwealth Universe by Peter F Hamilton.

The full Amber series by Roger Zelazney.

A series of fantasy novels by Diana Wynne Jones.

A series of fantasy novels by Lin Carter.

A Christian based fantasy series by C S Lewis.

A series of fantasy novels for younger readers by Lloyd Alexander.

A series within the Deryni world.

A series of science fiction novels by John Connolly and Jennifer Ridyard.

The overall span of Thomas Covenant novels in order.

The first trilogy by Stephen R Donaldson with Thomas Covenant as the main character and introducing The Land.

A series by Jim Butcher.

A series of children's books.

A duology written by Kevin J Anderson and Neil Peart from the rock band Rush.

A series of sci-fi novels written by Piers Anthony.

A series of novels by Jim Butcher.  To my understanding - supposedly these books sprang from a debate over what was better in a story, great character development or a unique story idea.  Jim Butcher asked for two known story ideas and he said he would make an interesting story out of them using character development.

A series of books that collect the short stories of Louis L'Amour.

A series of science fiction novels by A Bertrand Chandler.  These are set within the Rim Worlds series.

A series of science fiction omnibus works containing two novels each of the John Grimes series by A Bertrand Chandler.  Also a part of the Rim World series.

A sub-series of science fiction novels taking place in the Commonwealth Universe by Peter F Hamilton.

An overarching science-fiction series by Peter F Hamilton.