Delusion of pregnancy (DOP) is a rare phenomenon especially in the elderly, with only 22 cases being reported. In this report, we present a case of a 74-year-old female with DOP and depressive disorder. In this case, a diagnosis of persistent delusional disorder was considered as the DOP persisted even after resolution of depressive symptoms with the use of antidepressants, antipsychotics, and electroconvulsive therapy.