Comics Buyer's Guide (CBG; ISSN 0745-4570), previously called The Buyer's Guide for Comic Fandom, was the longest-running English-language periodical reporting on the American comic book industry. It was founded in 1971 by Alan Light, a 17-year-old comic book collector in the Quad Cities region who oversaw it until 1983. That year, Light accepted an offer from Krause Publications, and operations moved to Iola, Wisconsin and the name changed to Comics Buyer's Guide. Annual Comics Buyer's Guide Fan Awards were established, and they were awarded 1983–circa 2010. Due to a decreased market for a comic book trade publication, the Comics Buyer's Guide released its last issue in March 2013.

CBG was founded in February 1971 by Alan Light under the title The Buyer's Guide for Comic Fandom (TBG) as a monthly newspaper in a tabloid format. TBG began primarily as an advertising venue – known in comics fandom as an "adzine", i.e. a fanzine devoted to ads. Ron Frantz, in his book Fandom: Confidential, traces the lineage of Light's endeavor to Stan's Weekly Express (aka WE), a pioneering adzine published from 1969 to 1973, whose bare-bones approach was inspired by an "obscure journal of flower advertising known as Joe's Bulletin". Frantz also provides background on Light's interaction with the WE Seal of approval program, with which he cooperated in order to help combat mail fraud. Frantz in addition describes the infamous long-running feud between Light and Comics Journal founder Gary Groth.

TBG's frequency was changed to twice-monthly with issue #18 (August 1, 1972). Besides occasional letter columns, beginning with issue #19 (Aug. 15, 1972), prominent fans Don and Maggie Thompson began a monthly column, "Beautiful Balloons." A news column, "What Now?" by Murray Bishoff, was added with #26 (Dec. 1, 1972). These provided the editorial content required by the United States Postal Service to qualify for second class mail (along with paid subscriptions being instituted with issue #27, January 1, 1973). At this time, TBG's circulation was about 3,600 copies.

TBG went weekly with issue #86 (July 18, 1975). In 1977, TBG's circulation topped 10,000. Cat Yronwode succeeded Bishoff as news reporter with issue #329 (March 7, 1980), renaming the column "Fit to Print".

In 1983, The Buyer's Guide was purchased by Krause Publications. Columnists Don and Maggie Thompson were hired as editors. Krause changed the name with their first issue #482 (February 11, 1983) to Comics Buyer's Guide. At that time Krause instituted the controversial CBG Customer Service Award, the display of which signifies an advertiser had a "clean bill of health". By the late 1980s, the publication had more than 20,000 subscribers.

Writer Peter David's column, "But I Digress...", joined the publication in 1990. The magazine added Mark Evanier's column "P.O.V." in late 1994.

In 1992, the magazine spun off its distributor and retailer news into a separate periodical, Comics & Games Retailer (which ceased publication in 2007). Co-editor Don Thompson died on May 23, 1994. In 1998, Krause brought on John Jackson Miller as managing editor and Brent Frankenhoff as projects editor, with Maggie Thompson remaining as editor.

CBG was named Best Comics Publication in the 1985 Kirby Awards, and it was given the Eisner Award for Best Comics-Related Periodical/Publication in 1992 and 1993.