Grandiose delusions Grandiose delusions are a type of delusions that are commonly found in individuals with conditions such as bipolar disorder, schizophrenia, and narcissistic personality disorder. These delusions are characterized by an exaggerated sense of self-importance, power, knowledge, or identity, often involving unrealistic beliefs about wealth, fame, or special abilities. For example, an individual with grandiose delusions may believe that they are a famous celebrity, have special powers, or is destined to perform great deeds or achieve great success. These delusions can be firmly held, despite overwhelming evidence to the contrary, and can significantly impact an individual's functioning, relationships, and overall quality of life. Grandiose delusions are associated with various negative outcomes, including decreased quality of life, increased functional impairment, and increased risk of substance abuse and suicide. Treatment of grandiose delusions typically involves