Erotomania, also known as de Clérambault's syndrome, is a relatively uncommon paranoid condition that is characterized by an individual's delusions of another person being infatuated with them. It is listed in the DSM-5 as a subtype of a delusional disorder. Commonly, the onset of erotomania is sudden, and the course is chronic.

Gaëtan Henri Alfred Edouard Léon Marie Gatian de Clérambault was a French psychiatrist.