Adrian Plass (born 1948) is a British author and speaker who writes primarily Christian humour, but also short stories, Bible commentaries and novels with a more serious tone.

His most popular books are a series concerning The Sacred Diary of Adrian Plass which is a humorous, fictional satire of Christian life and which has sold over a million copies worldwide.

[1][5] Plass followed this up with The Horizontal Epistles of Andromeda Veal in 1988 and The Theatrical Tapes of Leonard Thynn in 1989 to create the Sacred Diary Trilogy.

[9] The Church of England Newspaper says that "although it would be unrealistic to claim that Plass has solved all the mysteries, he does offer interesting theories which lead to one major conclusion", that is "a Caring God", and concludes there is "much to think about", although fundamentalist Christians may not agree with the author.

His novel "Silver Birches" (published in 2009), was turned into a film directed by Randall Stevens, with screenplay by Mark Freiburger and starred Natasha Little, Anna Acton and Todd Carty.