Gregor and the Curse of the Warmbloods is an epic fantasy children's novel by Suzanne Collins. It is the third book in The Underland Chronicles, and was first published by Scholastic in 2005. The novel takes place a few months after the events of the preceding book, in the same subterranean world known as the Underland. In this installment, the young protagonist Gregor is once again recruited by the Underland's inhabitants, this time to help cure a rapidly-spreading plague.

Suzanne Marie Collins is an American author and television writer. She is best known as the author of the young adult dystopian book series The Hunger Games. She is also the author of the children's fantasy series The Underland Chronicles.