Betty JoAnne Trimble, universally known as Bjo Trimble (maiden name Betty JoAnne Conway) is an artist, writer, and a strong presence in Star Trek fandom. Trimble was one of the major forces behind the letter-writing campaign that saw the original series renewed for its third season. She was also the driving force behind the letter-writing campaign that urged President Ford to change the name of the first space shuttle to Enterprise. Trimble and her husband John also helped set up Lincoln Enterprises, the mail-order company run by Majel Barrett-Roddenberry.

Her only “official” work is the Star Trek Concordance, an episode guide and encyclopedia for The Original Series and The Animated Series, which began as a fandom publication, but was later published by Ballantine Books and endorsed by Paramount. Her fan works include the previously-mentioned encyclopedia and On the Good Ship Enterprise, a humorous work detailing her fifteen-year involvement with the show. Trimble has also written articles for numerous sci-fi magazines, including Starlog (for whom she wrote the Fan Scene column, concerning the fandom phenomena, that ran from issues 33, 1980 through 69, 1983) and the magazines of the US and UK official Trek fan clubs.