Perfect Nanny (; released as Lullaby in Canada, India, Ireland and the UK) is a 2019 French drama film based on the eponymous novel by Leïla Slimani.
Myriam, mother of two children, decides to return to her job at a law firm, against her husband's wishes. Despite this, the couple begins looking for a nanny. After interviewing several candidates, they ultimately hire Louise. She quickly becomes beloved by the children and gradually takes on a central, even unsettling, role within the family.