A series of short fiction by Dean R Koontz that is also broken down into subseries called seasons.

A series of middle grade novels written to appeal to young girls starring Nancy Drew who solves mysteries.  They were written by several people using the pen name Carolyn Keene.  The first thirty-four books in the series were later revised to be more up-to-date and to remove some unfavorable stereotypes beginning in  1959 until 1977.

This series includes the original 64 books starting with The Secret of the Old Clock and ending with Captive Witness (1981) and only includes the revisions of the first 34 books.  The copyright dates for these are the revised dates since I consider the originals to be different "books" even though they have the same title.  I have not decided whether not to document the titles for the original series as of now.

For the books in this series I've added the "true" author to the list (even if this is questionable) along with the psuedonym Carolyn Keene that is credited on each book.

This is a series of graphic novels reprinting the English translations of Neon Genesis Evangelion manga.

Sister of Darkness.  Takes up from the Sword of Truth series and then the Richard and Kaylen series.  Written by Terry Goodkind.

A science fiction duology by Robert Silverberg and Randall Garrett.  Also known as Nidor.

A series of science fiction novels by Peter F Hamilton.  Originally three novels but was broken down into six when released to paperback.  A part of the Confederation series that consists this series as some short stories.

Nikki Heat is a series of books written by Richard Castle as seen on the Castle television series.  At least some of them (if not all) are written by the author Tom Straw.

This is a series of graphic novels reprinting the English translations of Tenchi manga.

A series of military science fiction from the author David Drake.

A science fiction series written by A E van Vogt.

A series within the Tortall universe.

A science fiction space adventure series written by Joshua James and Daniel Young.

A series of horror/mystery novels about a man who can see ghosts and has other supernatural talents.

A series of graphic novels that take place with the character Odd Thomas by Dean Koontz.

A series of historical fiction by Zane Grey.

Science fiction series by John Scalzi.

The Outlander series is a historical fiction, fantasy series.

A Series by Connie Willis

A series of children's fantasy books written by L Frank Baum.

The seventh the Dray Prescot series.

A series of science fiction books by Frank Herbert and Bill Ransom.  Also known as the Pandora Sequence.

A series of science fiction books written by Jonathan Yanez.

A series of science fiction for teens by author Orson Scott Card.

A series of fiction from Edgar Rice Burroughs about a hollow earth.

A series of novellas set in the World of the Five Gods by Lois McMaster Bujold.

The mega-series of Pern books in publication order.

The first trilogy of Kushiel's Legacy.

The series of children's books about Pippi Longstocking.

A science fiction series written by Jack Vance.  Also known as the Tschai series.

Historical military fantasy series by R F Kuang.

A series that is a subseries set in the Revelation Space series by Alastair Reynolds.

A fantasy trilogy by R Scott Bakker.  This is a sub-series of The Second Apocalypse.

A series by Sir Arthur Conan Doyle.

A series within the Tortall universe.

A dualogy by Nancy McKenzie about the Aurthurian legend.

A fantasy series by Robin Hobb set in the Realm of the Elderlings.

A series of fantasy novels by Martha Wells.

A science-fiction series created and written by Arthur C Clarke.  Books later in the series co-authored by Gentry Lee.

A series of fantasy novels by Robin Hobb in which most of her stories are based.

A series of books by Brandon Sanderson written more for the Young Adult crowd.

A series of fantasy / sci-fi books by Pierce Brown.

A science fiction series written by Liu Cixin in Mandarin (I believe).

A series of fiction novels written by Michael Connelly featuring Renée Ballard - a night shift detective in the LAPD.  These take place in the world of Harry Bosch.

A series of science fiction books by Alastair Reynolds that take place in the Revelation Space universe.