Autoimmune parkinsonism and related disorders are immune-mediated central nervous system disorders that present with extrapyramidal signs such as involuntary movements, hypokinesia, and rigidity. Patients commonly have neurological signs other than the extrapyramidal signs. Some patients show a slowly progressive clinical course with neurological symptoms resembling those of neurodegenerative disorders. Occasionally, specific autoantibodies targeting the basal ganglia or related sites are detected in their serum or cerebrospinal fluid. These autoantibodies are important diagnostic markers for these disorders.