Mary Ellen Wilson, also called Mary Ellen McCormack, was an American victim of child abuse whose case led to the creation of the New York Society for the Prevention of Cruelty to Children, the first child protection agency in the world. At the age of eight, she was severely abused by her foster parents, Francis and Mary Connolly. Because she was assisted by Henry Bergh, then the head of the American Society for the Prevention of Cruelty to Animals, some sources incorrectly state that statutes against cruelty to animals had to be used to remove her from the home. Hers was the first documented case of child abuse in the United States.

Child abuse is physical, sexual, emotional and/or psychological maltreatment or neglect of a child, especially by a parent or a caregiver. Child abuse may include any act or failure to act by a parent or a caregiver that results in actual or potential wrongful harm to a child and can occur in a child's home, or in organizations, schools, or communities the child interacts with.