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Uncle John's Bathroom Readers are a series of books containing trivia and short essays on miscellaneous topics, ostensibly for reading in the bathroom. The books are credited to the Bathroom Readers' Institute, though Uncle John is a real person named John Javna, who created the series along with his brother Gordon, as well as a team of assistants. The books are published by Portable Press, an imprint of Printer's Row Publishing Group. The introductions in the books, as well as brief notes in some articles, provide small pieces of information about Uncle John. The first book was published in 1988, and in 2012, the series reached its 25th release, The Fully Loaded 25th Anniversary Bathroom Reader. Volumes dedicated to a single topic have been released, under the title Uncle John Plunges Into , for example: history, presidents, and the universe. There are also books on individual U. S. states, the weather, numbers, quotes, the year 2000, a special book for mothers, cat lovers, dog lovers, horse lovers, love, Uncle John's Book of the Dumb, and several Bathroom Readers for Kids Only!. Though most of the books were written by the Bathroom Readers' Institute, some of the ones that are based around a specific subject are written by a lone author, who is not in the Institute. Additionally, the Institute will often publish articles and other contributions sent in from readers. Recurring articles such as "Flubbed Headlines", "Oops", and "Classifieds" often depend on these contributions. Currently, the institute publishes three books a year; a "classic" reader, and two "plunges into" editions, one for a location such as a U. S. state, and another of a specific topic. Their volumes contain information on subjects such as quotes, dumb criminals, palindromes, anagrams, urban legends and hoaxes, failed inventions, the history of everyday things, and accidental discoveries, as well as articles on pop culture and 'celebrities' such as Emperor Norton (see Features). Throughout the books, there are what the BRI calls "running feet"—short fun facts on the bottom of each page. A typical example is "An object on Jupiter would weigh 144,000 times more than it would on Pluto." Uncle John's also publishes Page a Day calendars with Workman Publishing Company. The series has sold 15 million copies.

The Bathroom Readers' Institute began in 1988, with the publishing of the original Uncle John's Bathroom Reader, by St. Martin's Press Publishers. After the book's success, Uncle John's 2nd Bathroom Reader was published in 1989, with a third and a fourth book being added to the series in the subsequent years. These earlier books are distinct from the rest not only because of their short length, but because of the writing style: Short articles starting with a brief history of the subject, followed by several tidbits on the subject.

After the initial four books, the BRI decided that it would publish further volumes under its own label, and Uncle John's 5th Bathroom Reader was released in October 1992; notable for a revised writing style, more and longer articles, and the introduction of new recurring features, Uncle John's 5th set what would become the standard design for every book going forward. The Fifth, Sixth and Seventh Bathroom Reader went out of print in 1994, and would later be re released as a single volume, Uncle John's Legendary Lost Bathroom Reader. In 1995, the millionth copy of the series was sold, and to celebrate the milestone, the BRI released an eighth volume, The Best of Uncle John's Bathroom Reader.

In 1996, the Bathroom Readers' Institute revised its writing style yet again, adopting a more 'encyclopedic' style, as well as spreading longer articles throughout the book. In 2000, John Javna retired from the Bathroom Reader series to care for his elderly parents, and the series was run thereafter by his brother Gordon, who had co created the series with him.

For the first 15 years, "Bathroom Readers" referred to just one series. Now, there were several competitors (none quite as successful) and quite a few series within the BRI. Books 15–18 began to move away from the format seen in previous books, using two and three part articles, and sometimes removing popular recurring features in favor of the longer format. For a time, the Bathroom Reader series was owned by Advanced Marketing Services, a discount books distributor that went bankrupt in 2007, after which it was sold to a new owner with Gordon Javna continuing to steward the series until 2016. In 2012, Uncle John's Bathroom Reader celebrated its 25th anniversary with the publication of "Fully Loaded 25th Anniversary Bathroom Reader". With the 28th edition of the series, the cover was completely overhauled, with a new flexibound cover instead of the old paper. With the 30th anniversary of the series in 2017, the books were updated to feature a new interior design. The flexibound covers were discontinued with the 35th anniversary in 2022. Gordon Javna retired from the series in 2016 after the Bathroom Reader offices in Ashland, Oregon were closed.