Purpose This singlecase study aimed to investigate the effects of trunk stabilization intervention based on the Bobath concept on balance and gait in a patient with hemiplegia. The intervention focused on improving postural control by enhancing trunk stability and extensor muscle activation, which are core components of the Bobath approach. Methods The participant was a 17yearold male diagnosed with right hemiplegia following an intracerebral hemorrhage (ICH) and intraventricular hemorrhage (IVH) caused by a ruptured arteriovenous malformation (AVM). The intervention was administered five times over one week, with each session lasting approximately 60 minutes. The treatment employed a goaldirected therapeutic approach designed to stabilize the trunk and facilitate extensor muscle activation. Results Following the intervention, notable improvements were observed in trunk postural alignment against gravity. The Trunk Impairment Scale (TIS) and Berg Balance Scale (BBS) scores each increased by 3 points. Additionally, the time required to complete the Timed Up and Go (TUG) test decreased, indicating improved mobility. Conclusion A oneweek Bobathbased trunk stabilization intervention led to measurable functional improvements in balance and gait in a patient with hemiplegic stroke. These findings suggest that the Bobath concept can be an effective clinical strategy for enhancing trunk control, balance, and gait performance in individuals with hemiplegia.