Megalomania ( from the Greek word μεγαλομανία) is a psychopathological condition characterised by delusional fantasies of wealth, power, or omnipotence. It includes an obsession with grandiose or extravagant things or actions. It is sometimes symptomatic of manic or paranoid disorders.

In fiction

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Megalomania is portrayed very often in fiction, usually as an affliction of supervillains. It is not always used in a strictly correct manner. For instance, it is common for a villain to be described as a "megalomaniac" if he demonstrates an obsession with gaining immense power and wealth (rather than a delusion that he already possesses these things). However, fiction also contains genuinely megalomaniacal supervillains (for instance, the villain in Flash Gordon Conquers the Universe), and the lesser sense of an obsession with grandiose or extravagant things or actions is a common supervillain trait.

Charlie Chaplin parodied the more amusing and ridiculous aspects of megalomania in his classic movie comedy about Adolf Hitler The Great Dictator.