• Secret identity
  Secret identity
  A secret identity is an element of fiction wherein a character develops a separate persona , while keeping their true identity hidden. The character also may wear a disguise...
  
  , an alternate persona used to conceal a person's true identity, often associated with fictional characters such as superheroes
• Undercover
  Undercover
  Being undercover is disguising one's own identity or using an assumed identity for the purposes of gaining the trust of an individual or organization to learn secret information or to gain the trust of targeted individuals in order to gain information or evidence...
  
  , disguising one's own identity or using an assumed identity for the purposes of gaining the trust of an individual or organization

In entertainment

• Secret Identity, a 2006 novel based on the television series Lost
  Lost (TV series)
  Lost is an American television series that originally aired on ABC from September 22, 2004 to May 23, 2010, consisting of six seasons. Lost is a drama series that follows the survivors of the crash of a commercial passenger jet flying between Sydney and Los Angeles, on a mysterious tropical island...
  
  
• My Secret Identity
  My Secret Identity
  My Secret Identity is a Canadian television series starring Jerry O'Connell and Derek McGrath. Originally broadcast from September 1, 1988 to May 1, 1991 on CTV in Canada, the series also aired in syndication in the United States.-Synopsis:...
  
  , a 1980s television series about a teenage superhero
• Superman: Secret Identity
  Superman: Secret Identity
  Superman: Secret Identity is a four-issue mini-series of 48 pages each in prestige format, written by Kurt Busiek and illustrated by Stuart Immonen. The first issue was published in January 2004, and the limited series ran until April 2004. A re-release of the first two issues will become available...
  
  , a 2004 DC Comics miniseries
• "Secret Identity", a song by The Jealous Girlfriends
  The Jealous Girlfriends
  The Jealous Girlfriends is a rock band based in Brooklyn, New York. Their music video for "How Now", directed by Sarah Soquel Morhaim, won first place for the iPod Music Video Contest.-Biography:...
  
   from The Jealous Girlfriends (album)
  The Jealous Girlfriends (album)
  -References:...