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The Library Ghost (aka The Grey Lady, Gray Lady, Librarian Ghost) was the ghost of the librarian Eleanor Twitty and the very first ghost that the Ghostbusters ever encountered. She appears to be a very odd reader as she likes to stack books up in the air. She was a minor character in the first movie and a major character of the Library level of the Ghostbusters video game.
- In the film, the Library Ghost is portrayed by the late Ruth Oliver.
- She is featured in the Firehouse Headquarters LEGO set.
- She also appears briefly in the level The Phantom Zone as an reference in the Firehouse Ghost containment area. She then shushes the player then changes and flys off and creates flames.
- She also appears as a Gold Brick puzzle in the New York Library but she requires a mind control character such as Wonder Woman or Queenie Goldstein to solve it.