- The film is based on the 2016 novel of the same name by Emma Donoghue.
- Principal photography for the film began in Ireland on 12 August 2021.
- Elaine Cassidy (Rosaleen O’Donnell) and KÃla Lord Cassidy (Anna O’Donnell) are mother and daughter in real life.
- The Wonder premiered at the Telluride Film Festival on 2 September 2022. The film had a limited theatrical release on 2 November 2022 and streamed on Netflix on 16 November 2022. It received positive reviews from critics who praised the production design and cast performances, particularly Pugh’s.