Oppositional defiant disorder (ODD) is one of a group of behavioral disorders called disruptive behavior disorders (DBD). These disorders are called this because children who have these disorders tend to disrupt those around them. ODD is one of the more common mental health disorders found in children and adolescents. This paper discusses the following topics on ODD: (1) What Is Oppositional Defiant Disorder (ODD)?; (2) How Common Is ODD?; (3) What Causes ODD?; (4) What Are the Symptoms of ODD?; (5) How Is ODD Diagnosed?; (6) Can ODD Occur with Other Conditions?; (7) Can ODD Be Prevented?; (8) How Is ODD Treated?; (9) How Long Does Treatment Typically Last?; (10) Does ODD Improve over Time?; (11) Which Therapies Have Been Shown Not to Work?; and (12) What Does the Future Hold?