A series of fantasy novels by Carole Nelson Douglas.

A fantasy series written by John Morressy

A series of fiction novels written by Michael Connelly featuring crime reporter Jack McEvoy.  These take place in the world of Harry Bosch.

A series of action / adventure novels by Lee Child and later also by Andrew Child featuring the main character Jack Reacher.

A series of novels written featuring the character Jack Ryan created by Tom Clancy or taking place in the same fictional world.  I've only included books written by other authors and not by Tom Clancy in this list.

A series of novels written by Tom Clancy featuring the character Jack Ryan or taking place in the same fictional world.  I've only included books written by Tom Clancy in this list (even if he collaborated).

A sci-fi series by Ron Goulart.  This is a sub-seris of the Barnum System.

A series of fantasy novels by Sharon Green

A science fiction series by Rivers Coffman.

A series a spy thrillers written by Ian Fleming in the mid-20th Century that went on to become a somewhat successful movie franchise.

An action/adventure series written by Dean Koontz featuring Jane Hawk, a former FBI agent on the run.

A series of books written by Robert Ludlum.  Other authors have also contributed - but they are not included in this series.

The fifth the Dray Prescot series.

A fiction series written by C J Box.

A series of stories written by Rudyard Kipling.

Series of books by Michael Crichton.

A fantasy series by John Morressey

A series of fantasy novels by Piers Anthony and Robert E Margroff.

A series of thrillers by Iris and Roy Johansen.

A science fiction series by Kenneth Bulmer.

A series related to the Malazan Book of the Fallen series written by Steven Erikson.

A series of westerns by Louis L'Amour about a man named Lance Kilkenny.

A series of fantasy books for Jeff Wheeler.

A series of fantasy books by Patrick Rothfuss.  These are the talling of a tale told over three nights.

A series of fantasy novellas by Stephen R Donaldson.

A series of science-fiction novels written in the same universe created by Larry Niven.

The Konrath/Kilborn Collective is a loose collection of horror stories by J A Konrath (some under the psuedonym Jack Kilborn).

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

The third the Dray Prescot series.

A fantasy series by Jacqueline Carey.

The third series in the Thomas Covenant books published about twenty years after the Second Chronicles of Thomas Covenant

A fantasy series by Daniel Greene.

A series of science fiction novels written by Larry Niven with Steven Barnes and Jerry Pournelle on the first two novels.

Star Wars series taking place after the Star Wars: Dark Nest series.

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

A fantasy series based in Japan which is also the basis for the Legend of the Five Rings collectible card game as well as the Legend of the Five Rings role-playing game.

A series within the Deryni world written by Katherine Kurtz.  Also called "Legends of Saint Camber".

A series set in the early years of the Dune mythology.

Set in the world of Riyria.

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

A series by Brandon Sanderson.

Leibowitz Series

A series of science fiction books written in the early 20th Century by E. E. "Doc" Smith.

A science fiction series by M A Foster.

A fantasy series by James Islington.

A fantasy series written by Brent Weeks