1. A Changeling is the child of trolls or elves left in exchange for a human child in various European legends.
2. The Changeling is an episode of Star Trek: The Original Series.
3. The Changeling is a Jacobean play by Thomas Middleton and William Rowley.
4. The Changeling is a 1980 horror film film starring George C. Scott. It is also the title of a 2002 German film, as well as several films based on the play by Middleton and Rowley.
5. The Changeling is the title of a book by Roger Zelazny.
6. The Changeling is a computer role-playing game.
7. Changeling: The Dreaming is a role-playing game published by White Wolf.

To many people the word changeling suggests change, and is used (in a technically incorrect sense) for creatures that can change their shape. In this sense:

1. The Changelings was the working title of the Animorphs television series.
2. Changeling a shapeshifter in the Marvel Comics universe.
3. Changeling (also known as Beast Boy) is a shapeshifter in the DC Comics universe.
4. Changelings are a race of alien shape-shifters in the Star Trek universe. Odo from Star Trek: Deep Space Nine is a Changeling.
5. Changelings are a shapeshifting player character race in the D&D setting Eberron