Cuckoo's Egg is a science fiction novel by American writer C. J. Cherryh, which introduces a fictional race raising a human boy. It was published by DAW Books in 1985, and there was also a limited hardcover printing by Phantasia Press in the same year. The book was nominated for the Hugo Award and longlisted the Locus Award for Best Novel. It was later reprinted along with Cherryh's novel Serpent's Reach in the 2005 omnibus volume The Deep Beyond.

Carolyn Janice Cherry, better known by the pen name C. J. Cherryh, is an American writer of speculative fiction. She has written more than 80 books since the mid-1970s, including the Hugo Award–winning novels Downbelow Station (1981) and Cyteen (1988), both set in her Alliance–Union universe, and her Foreigner series. She is known for worldbuilding, depicting fictional realms with great realism supported by vast research in history, language, psychology, and archeology.