Background and purpose: Reduction in gait ability is considered the most common problems in patients with traumatic brain injury (TBI). Approximately 83% of patients with moderate to severe TBI continue to demonstrate impairments in balance and gait after discharge from rehabilitation that affect their independence in activities of daily living (ADL). This case report aimed to examine the impact of task-oriented circuit class training on gait ability focusing on balance, gait speed, and gait endurance (functional capacity) in a 34-year-old man with TBI. Case description: The patient was a 34-year-old man with 1-year post-TBI. Twelve sessions of the task-oriented circuit class training were provided. Outcome measures included the six-minute walk test (6-MWT) and Berg Balance Scale (BBS). Outcomes: His BBS score improved from 34/56 to 41/56. Six-minute walk distance increased by 62.9 m, and gait velocity increased by 0.25 m/second. Conclusion: The use of the task-oriented circuit class training protocol may be feasible in patients with TBI. Through 12 sessions, the patient showed improvement in gait ability resulting from increased balance ability, gait velocity, and endurance. Future high-quality studies with a large sample size are strongly needed to verify our findings.