A series of fantasy books written by George R R Martin.  Probably will never be finished.

Not for children!

A series within the Tortall universe.

A science fiction series by Jack L Chalker.

The series started in Arthur C Clark's 2001: A Space Odyssey.

The eleventh the Dray Prescot series.

A series of fantasy novels by Alan Dean Foster.

The sixth the Dray Prescot series.

A series of self published science fiction novels by Randolph Lalonde issued as "broadcasts" instead of volumes.

Cyberpunk series written in the 1980s giving birth to the term cyberspace, etc...

A series of science fiction novels by Ben Bova.

Star Trek novels with slightly more pages that the Star Trek Novels and unnumbered.

Star Trek novels that began with the novelization of Star Trek: The Motion Picture in 1981 and are published periodically.

The numbered series of Star Trek: Deep Space Nine novels based on the television series.

Unnumbered Star Trek: The Next Generation novels based on the television series.

The numbered series of Star Trek: The Next Generation novels.

A series based on the Star Trek: Voyager television show.

This series is the set of Star Wars novelizations from the movies.

Star Wars novels.  This is the mega-list of Star Wars novels in chronological order within the Star Wars Universe.  I still consider these to be canon and consider all Disney Star Wars to be bad fanfic.

My personal focus on these books was everything from Star Wars - later called A New Hope - forward.

Star Wars trilogy takes place after the New Jedi Order series.

A Trilogy of novels set in the Star Wars Universe 11 ABY.

This series is set about twenty-five to thirty years after Star Wars and chronicles the New Republic's encounter with extra-galactic forces called the Yuuzhan Vong.

A science fiction series by Frederick Pohl and Jack Williamson.

A series in the DDT-verse by Christopher Stasheff.

A science fiction series by Edmond Hamilton.

A series of science fiction books by Larry Niven.  These do not appear to take place in Known Space.  Sometimes referred to as the Leshy Circuit.

A series of fantasy novels written by Brandon Sanderson that takes place in the Cosmere.

A series of science fiction stories by Larry Niven.

A series of fantasy books begun in 1994 by Terry Goodkind.

A series of cyberpunk novels written by Richard K Morgan with Takeshi Kovacs as the main character.  It takes place in a dystopian future when human minds can be stored in data stacks and "resleeved" into other bodies.

A series of fantasy novels that take place in an alternate Earth timeline.

A series fantasy of books by Alan Garner.

Short story collections

A series of westerns written by Louis L'Amour.

A series of fiction novels written by Edgar Rice Burroughs.

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

A series of action / adventure novels by Jack Carr featuring the main character James Reece.  Sometimes also known as James Reece series.

A science-fiction series by Ada Palmer.

A science fiction series by Craig Martelle and Michael T Anderle.

A series of novels set within the Harry Bosch world featuring FBI agent Terry McCaleb.

A subseries of books by Brandon Sanderson taking place in the Reckoners universe.

A dualogy of Christan fiction by Frank E Peretti.