A spoiled child (also called a spoiled brat) is a child that exhibits behavioral problems from overindulgence by his or her parents. Spoiled children may be described as "overindulged", "grandiose", "narcissistic" or "egocentric-regressed". There is no accepted scientific definition of what "spoiled" means, and professionals are often unwilling to use the label because it is considered vague and derogatory. Being spoiled is not recognized as a mental disorder in any of the medical manuals, such as the ICD-10 or the DSM-IV, neither is it part of the proposed revision of this manual, the DSM-5.

In 1989, Bruce McIntosh coined the term the "spoiled child syndrome". The syndrome is characterized by "excessive, self-centered, and immature behavior". It includes lack of consideration for other people, recurrent temper tantrums, an inability to handle the delay of gratification, demands for having one's own way, obstructiveness, and manipulation. McIntosh attributed the syndrome to "the failure of parents to enforce consistent, age-appropriate limits", but others, such as Aylward, note that temperament is probably a contributory factor.