An author who doesn't want their authorship known will use a Pen Name. An author who wants everyone to know they don't want their authorship known will use Anonymous, or a pen name that very obviously presents itself as a pen name.
This is done to convey the impression — which may even be true — that the author would be in trouble were his or her identity known. So it's often done with controversial works, or works that wish to present themselves as such, and with exposes.
- The My Little Pony: Friendship is Magic oneshot Bubbles is a widely circulated story, but its writer is unknown.
- Primary Colors by Anonymous. Fifteen years later, "O" by Anonymous.
- Also by Anonymous The Book With No Name.
- A Prussian nobleman wrote plays under the name J.E. Mand — jemand is German for "someone."
- Go Ask Alice... allegedly.
- The Bride Stripped Bare. Australian Nikki Gemmell eventually revealed her authorship.
- The Name Of This Book Is Secret and its sequels by Pseudonymous Bosch, although it's pretty much confirmed by now that he's author Raphael Simon.
- Frankenstein, on its initial publication, to hide that the author was a young woman.
- During her lifetime, Jane Austen's novels only identified the author with the words "By a Lady". Parodying this, The Two Ronnies serial "The Phantom Raspberry Blower of Old London Town" was credited to "Spike Milligan & A Gentleman" (The Gentleman being Ronnie Barker).
- The Federalist Papers was published under with the pseudonym "Publius". The papers were drafted in response to the Anti-Federalist Papers, a series of parallel essays, published under the pseudonyms "Cato", "Brutus", "Centinel", and "Federal Farmer".
- The author of Girl: Who are you? Alien: Er, Im an alien. is completely anonymous. Not even so much as a pen name or username is given, as the forum the story was posted on allowed users to post without revealing their names.
- The identity of George Kelting, star of The Television Ghost, was kept a secret during the show's run in the early 1930s. His name was only revealed in the 1986 book American Television Drama: The Experimental Years.
- In 1989, a song called "Spelling on the Stone", a jokey reference to the Elvis Lives myth, was released by an unknown Elvis impersonator with no name put on the single or album. Despite being issued on a major Country Music label (Curb Records) and spending some time on the Billboard charts, the song's performer has never been identified.
- Many of the credits in Mega Man II are aliases, e.g. Inafking, Tom Pon, 2m03cm Man, Yuukichan's Papa, Fish Man)
- The Wotch by Anne Onymous.
- Vox and King Beau is a Creepypasta originally posted on /x/ that takes the format of a young woman named Vox who posts on /x/ looking for advice. The author of the story never goes by anything other than Vox or hints to the story being fictional at all.
- cool and new web comic is a parody of Homestuck by an author known as "o". There are many theories as to who the author is, to the point that the very mystery of his identity is a meme.
- The animation studio that made the short Dream Come True: A Mule Mom's Story is completely unknown. No credits are included, and the only known crew member is sound designer Shawn Sussman, who uploaded the video to YouTube.