Wendy Orr was born in Canada and, because of her father's career in the Canadian Air Force, grew up in France, Canada and the United States. After high school, she studied occupational therapy in London. While on holiday she met and later married a holidaying Australian farmer. Orr emigrated to Australia after completing her studies.
While her husband worked on his dairy farm, Orr worked as an occupational therapist and began writing children's stories. Her first picture-book, Amanda's Dinosaur, was published in 1988. She has since written more than two dozen books for children, young adults and adults. After a serious car accident in 1991, Orr began writing full-time and consolidated her reputation with several awards and commendations during the 1990s. Her books have been translated into several languages, most notably the prize-winning young adult novel Peeling the Onion (1996) which has been translated into multiple European languages.
Orr's Nim duology (Nim's Island and Nim at Sea) were both adapted for film, the first with Abigail Breslin and the second with Bindi Irwin. Her most recent book, Dragonfly Song, written partly in free verse, won both the Prime Minister's Award for Fiction and the Adelaide Festival Award for Literature, and was a notable book for the Children's Book Council of Australia Awards.