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, and are published by Portable Press, an imprint of Baker & Taylor. 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. As of late, 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.