BACKGROUND: Juvenile DNAJC6-associated Parkinson's disease is a rare cause of early-onset parkinsonism with limited treatment data. CASE REPORT: We describe a 15-year-old female with a novel DNAJC6 variant presenting with progressive tremor, bradykinesia, and postural instability. Although initially responsive to levodopa, she developed severe medication-induced motor fluctuations refractory to multiple pharmacological therapies. Due to disabling tremor, bilateral globus pallidus internus deep brain stimulation (GPi-DBS) was performed, resulting in marked and sustained tremor reduction. DISCUSSION: This case highlights the severe course of DNAJC6-associated juvenile parkinsonism and supports GPi-DBS as an effective option for refractory tremor.