Brucellosis is an endemic zoonotic infectious disease in Middle East countries including Iran. This infection may involve central nervous system. Psychosis has been reported in rare cases with chronic brucellosis.A 26-year-old male shepherd patient who developed neuro-brucellosis and psychosis is presented. He had hallucinations (visual and auditory) and delusions. He was also impulsive and had serious difficulty in speech.In patients with atypical psychosis in endemic areas, physicians should consider the portability of chronic brucellosis.