A secret identity is the practice of hiding a person's identity so the actual identity of the person is not known or suspected.

Legal uses of secret identity include people placed under witness protection programs to protect witnesses in criminal trials from retaliation from the criminal organizations they inform against. Law enforcement and intelligence agents often use secret identities in undercover operations in order to infiltrate criminal or foreign organizations for the purposes of investigations. Entertainers like professional wrestlers sometimes hide their identities beyond simple stage names in order create an appealing mystique for the audience.

Writers also often use pseudonyms in order to hide their identity. In some cases, such as with James Tiptree, Jr, the writer will use a pseudonym because the image required by the genre does not match the writer's actual identity. In the case of Richard Bachman, Stephen King wanted to know whether his writing as an "unknown" writer would get as much interest as his non-pseudonym work. Finally, a writer who produces several independent series of works featuring different recurring characters (such as John Creasey ) or who writes in different genres or styles (such as Nora Roberts) may use different names for each one.

In politics, the assumption of a secret identity is sometimes used to avoid adverse political consequences of an identity being publicized. Famous secret identities in politics include Deep Throat, the unnamed source for Watergate information and X, who wrote a famous essay outlining the United States policy of containment.

On the Internet, an alias or nickname is often used for privacy and abbreviation. (See also Internet friendship and Sherry Turkle's academic work.)

Secret identities of real people include:

• James Tiptree, Jr
• Richard Bachman
• X
• "Anonymous ", the author of Primary Colors
• Deep Throat - Watergate informant
• Publius , the authors of the Federalist Papers
• The Residents
• The Guerilla Girls
• Slipknot

see also: pen names

Secret identities in fiction

In fiction, secret identities are typical elements of crimefighters, vigilantes and superheroes who hide their identities both to preserve a private life and protect their loved ones from retaliation from their enemies. The artistic purpose of the concept on the part of the writers is that it allows the characters to have ordinary lives which can allow for human drama as well as create tension with the effort needed to preserve the secret. This can include challenges such as throwing off the suspicions of associates who suspect and the need to quickly improvise means to get out of sight to change identities. A costumed crimefighter might refer to their alternate identity as a "nom de guerre" (a literal usage of a French term for a pen name), and more than one supervillain has been punnishly referred to as having a "nom du crime".

The secret identities can be multi-layered; for example, Superman, The Shadow and Moon Knight all have real names, adopted identities and crimefighting codenames. Sometimes the distinction as to which identity is the "real" one is blurred; it has been said that Clark Kent pretends to be Superman, while Batman pretends to be Bruce Wayne rather than vice versa.

Famous fictional characters with secret identities include:

• Prince Adam - Secret Identity of He-Man
• Princess Adora - Secret Identity of She-Ra
• Kent Allard, Lamont Cranston - Secret identities of The Shadow
• Bruce Banner - Secret Identity of The Incredible Hulk
• Billy Batson - Secret identity of Captain Marvel
• Sir Percy Blakeney - Secret identity of The Scarlet Pimpernel
• Diana Prince - Obsolete secret identity of Wonder Woman
• Don Diego De La Vega - Secret identity of Zorro
• Jay Garrick, Barry Allen, Wally West - Secret identities of different incarnations of The Flash
• Barbara Gordon, Cassandra Cain - Secret identities of Batgirl
• Dick Grayson, Jason Todd, Timothy Drake, Stephanie Brown, Carrie Kelly - Secret identities of different incarnations of Robin
• Shin'ichi Kudo / Jimmy Kudo - Secret identity of Conan Edogawa
• Selina Kyle - Secret identity of Catwoman
• Peter Parker - Secret identity of Spider-Man
• Britt Reid - Secret identity of The Green Hornet
• Clark Kent - Secret identity of Superman
• John Reid - Secret identity of The Lone Ranger
• Steve Rogers, Johnny Walker - Secret identities of Captain America
• Alan Scott, Hal Jordan, Kyle Rayner - Secret identities of Green Lantern
• Shoeshine Boy - Secret identity of Underdog
• Eric Twinge - Secret identity of Bananaman
• Kit Walker - Secret identity of The Phantom
• Bruce Wayne - Secret identity of Batman
• Jason Bourne - Secret identity of David Webb
• Rock Light - Original name/Secret identity of Mega Man
• Blues Light - Original name/Secret identity of Proto Man. See also Breakman.