Rabbit syndrome (RS) is a rare extrapyramidal side effect of antipsychotic treatment. It is characterized by involuntary, rhythmic dyskinesias of mouth and lips excluding the tongue, and is most common under typical neuroleptics. There are also several reports of the syndrome in patients with the atypical antipsychotics risperidone and aripiprazole. We report a 74 year-old patient suffering from a bipolar affective disorder, who developed a rabbit syndrome following the intake of 20 mg/d olanzapine. To our knowledge this is the first case report of a RS due to olanzapine.