We studied 1086 AIDS patients in the last six years. Of these 389 (35.82%) had neurological manifestation and 7 (1.8%) male patients had abnormal involuntary movements (parkinsonism in 3, hemichorea-hemiballism in 2, spinal myoclonus in 1 and rubral tremor in another). All patients were men, 5 white and 2 black. Four were homosexual, 2 drug-users and 1 bisexual. The mean age was 33.14 years. The time between AIDS diagnosis and the onset of movement disorders was 23.8 months in 5 patients and in 2 it was the first symptom. The parkinsonian patients did not show any opportunistic infection in conection with the neurological symptoms but in the remaining four cases this relationship was suggested. The data showed that not only the opportunistic infection but also the AIDS virus may play an important role on the development of involuntary movements.