Unofficial publications
This is a list of unofficial Star Trek publications.

The terms unofficial, unauthorized, unlicensed and, on rarer occasions, illegal are frequently used interchangeably by the general populace at large. While they often perceive the first three expressions in particular as being synonyms,  there are subtle meaning differences between the three of them, and in some cases it is wise to keep these differences in mind, when it comes to works pertaining to Star Trek.

Unlicensed or unsanctioned are those works for which the official Star Trek franchise as the formal and legal copyright holder has not issued an official and legal publication license. All fan publications for example falls under this heading, such as Bjo Trimble's Star Trek Concordance, but also professional publications like These Are the Voyages: TOS, To Boldly Go: Rare Photos from the TOS Soundstage or Return to Tomorrow - The Filming of Star Trek: The Motion Picture, or academic treatises like Star Trek and American Television. In these cases the franchise refrains from raising objections, provided no use is made of copyrighted Star Trek material, imagery in particular, and that disclaimers are included. In the case of fan publications, a further requisite is that there are no profit motives involved. Works of these kind are condoned by the franchise as they further the overall Star Trek phenomenon – free publicity so to speak – without formally endorsing them. In very rare cases such as the Concordance and the Star Fleet Medical Reference Manual, the franchise itself picks them up for later reissues as fully licensed official publications.
Unauthorized is in one sense essentially almost the same as unlicensed, but with a stronger perceived negative connotation. These concern works the franchise itself prefers not to see in print, mainly for more critically voiced opinions and treatises, deeming them too "non-" and therefore undesirable for publicity reasons.  Publications from Schuster & Schuster and cast/crew (auto)biographies for example, fall under this heading, that is, as far as the franchise is concerned. An infamous example of a publication deemed undesirable by the franchise, concerned Michael Piller's book Fade In: The Making of Star Trek Insurrection, which was slated to become a licensed Pocket Books release, yet ultimately prohibited for release. According to Piller's widow Sandra the book was "brutally honest", clarifying to , "Well, when he first got the go-ahead from the studio to write the book, and he got it signed-off with all the actors and everyone... when he finally turned it in, he was shocked! They said, 'We can't let the public know what we do here, what goes on behind the scenes!" 
In a different sense, an authorized work can also be a publication initiative – as in commissioned – by the franchise itself (the various movie Making of... books from Pocket Books being the prime examples, including Piller's ultimately prohibited book), which is not necessarily true for other licensed works, like the later ones from GE Fabbri and Eaglemoss Collections. As a matter of fact, ever since Pocket Books was removed from the franchise mix in the mid-2000s, for reference works in particular, most licensed/sanctioned works are nowadays unauthorized in this sense as most outsider prospect authors and projectmanagers submit their proposals to the franchise in its current guise as Paramount Consumer Products for their approval and endorsement. When endorsed, authors and projectmanagers need to be in compliance with franchise guidelines, but can also apply for franchise support in the form of publicity and/or editing chores. A work therefore can be licensed but unauthorized – as in not being a franchise initiative – , whereas an unlicensed work is always unauthorized. During the Pocket Books era people like Judith and Garfield Reeves-Stevens, Jeanne M. Dillard, Paula M. Block (who also served as the franchise's "Senior Director of Licensing" at the time) and Terry J. Erdmann became authors most frequently commissioned/assigned by the Star Trek franchise itself to write on their behalf.
Authors of unlicensed works have on more than one occassion used the expression "unauthorized" as a commercial gimmick in the titles of their works in order to not only taunt the franchise, but also to induce uninitiated readers to believe that said franchise views these works as forbidden or illegal. However, very few of these works are actually "forbidden" in the formal and legal sense, due to the the "works of journalistic/academic nature" exemption clauses in copyright laws, protected under the First Amendment of the US Constitution (as emphatically stated in such works as These Are the Voyages: TOS, Return to Tomorrow, et.al), though again provided that no use is made of copyrighted Star Trek material. Since the name "Star Trek" itself is an officially registered and legally protected trademark ("Star Trek®"), most such authors even choose to err on the side of caution by only utilizing the abbreviation  "Trek" in the titles of their works, despite the worldwide and widespread use of the full expression in colloquial parlance. When these conditions are met, the franchise, even if they would have liked some works to be illegal, is impotent to initiate formal proceedings against these publications. Edward Gross and Mark A. Altman are two of the more prolific authors of "unauthorized Trek" titles. Some rare examples of truly illegal publications include The 24th Century Technical Manual for the reproduction of stolen studio production materials, and The Making of the Trek Films, which featured copyrighted imagery.
By definition all three categories are unofficial, but there is a later, additional twist involved for Star Trek works written from an in-universe POV. Works of these kind, typically novels and comics, can be fully authorized, licensed and endorsed by the franchise, yet still be deemed "unofficial" at the same time, as they fall outside what is currently seen as established canon. All such works are considered as "". The franchise reserves the right to assign the status "official" and "unofficial" at will. For example,  was once considered unofficial/apocryphal, but has been elevated to official/canon status since then, whereas then fully licensed/authorized reference books such as – besides the already mentioned Star Fleet Medical Reference Manual – Star Fleet Technical Manual,  Mr. Scott's Guide to the Enterprise and Worlds of the Federation were once considered official, but have as of 2002 been demoted to the status of apocrypha. () It is in this light that the meaning of the expression "official" in a work's title has shifted/expanded over the decades. When the franchise started to take a keen interest in Star Trek publications during the 1980s, the use of "official" in the title originally indicated that a work was licensed and endorsed, whereas the present usage when employed, additionally indicates a work that is in compliance with established canon.
Superfluously perhaps, unlicensed works do not constitute a source of income for the Star Trek franchise. Because of the perceived connotation with "illegal" and the initiative origins, the expression "unlicensed" should be the preferred one over "unauthorized", when labeling a work that is initiated and published outside the franchise's official framework.

2
The 24th Century Technical Manual

A
All I really need to know I learned from watching Star Trek
All You Need to Know About Disability is on Star Trek

B
The Best of Enterprise Incidents: The Magazine for Star Trek Fans
The Best of Trek
Beyond the Final Frontier
Beyond Star Trek
BFI TV Classics - Star Trek
A Brief Guide to Star Trek

C
Captains' Logs: The Unauthorized Complete Trek Voyages
Captains' Logs Supplemental - The Unauthorized Guide to the New Trek Voyages
The Classic Trek Crew Book
Star Trek: The Complete Unauthorized History

D
Deep Space Crew Book
The Deep Space Log Book: A First Season Companion
The Deep Space Log Book: A Second Season Companion
Deep Space Nine: A Celebration
Trek: Deep Space Nine: The Unauthorized Story
Trek: Deepspace Nine

E
Trek: The Encyclopedia
Enterprise Incidents: The Technical Book of Science Fiction Films
The Ethics of Star Trek

F
The Fifty-Year Mission, Volume One: The First 25 Years
The Fifty-Year Mission: The Next 25 Years
The First Star Trek Movie

G
Gene Roddenberry's Star Trek: The Original Cast Adventures
Star Trek: Good News in Modern Images
Great Birds of the Galaxy: Gene Roddenberry and the Creators of Trek

H
The History of Trek
Star Trek: The Human Frontier

J
The Joy of Trek

L
Let's Trek: The Budget Guide to the Klingons 1995
Life Signs: The Biology of Star Trek
Living with Star Trek: American Culture and the Star Trek Universe
Lost Voyages of Trek and The Next Generation
Trek: The Lost Years

M
The Making of the Trek Films
Meaning in Star Trek
The Meaning of Star Trek

N
The New Trek Programme Guide
Trek: The Next Generation Crew Book
Trek: Next Generation Tribute Book
The Next Generation Tribute Book Two
The Next Generation Tribute Book 3
Trek: The Next Generation

O
The Origins of the Star Trek Phenomenon

P
Star Trek: Parallel Narratives
The Physics of Star Trek
Trek: The Printed Adventures

R
Religions of Star Trek

S
Screen Plays: How 25 Scripts Made it to a Theater Near You - For Better or Worse
Ships of the Star Fleet
The Special Effects of Trek
Star Fleet Uniform Recognition Manual
Star Trek and American Television
Star Trek and History
Star Trek and History: Race-ing Toward a White Future
Star Trek and Sacred Ground
The Star Trek Guide
The Star Trek Universe: Franchising the Final Frontier
Star Trek Visions of Law and Justice
Star Wars, Star Trek, and the 21st Century Christians

T
To Seek Out New Life: The Biology of Star Trek
The Trek 25th Anniversary Celebration
The Trek Celebration Two
The Trek Celebration Three
The Trek Crew Book
The Trek Crew Companion
The Trek Encyclopedia
Trek Fan's Handbook
Trek in the 24th Century: The Next Generation and Deep Space
Trek Navigator: The Ultimate Guide to the Entire Trek Saga
Trek vs. The Next Generation

U
Trek: The Unauthorized Behind-The-Scenes Story of The Next Generation
The Unauthorized History of Trek
Trek: The Unauthorized Story of the Movies

W

 Unofficial publications