Background: Supracondylar fractures of the humerus are among the most common fractures in children, particularly in the age group of 5 to 10 years.To evaluate the outcomes of surgical management of supracondylarhumerus fractures in children using closed reduction and percutaneous pinning with Kirschner wires (K-wires). Material and Methods: This cross-sectional study included 100 pediatric patients aged 2–14 years with Gartland Type II and III supracondylar fractures treated at a tertiary care hospital. All patients underwent closed reduction under fluoroscopic guidance and percutaneous pinning with two or three K-wires. Outcomes were assessed using Flynn’s criteria, focusing on functional results, fracture healing, and complications. Statistical analysis included chi-square and logistic regression, with significance set at p < 0.05. Results: The majority (50%) of patients were aged 6–10 years, with a male predominance (60%). Gartland Type III fractures accounted for 55% of cases. Crossed pinning was used in 65% of cases and demonstrated better functional outcomes (95% good/excellent results, p = 0.04) compared to lateral pinning (85%). Functional outcomes were excellent in 70% of cases, with good outcomes in 20%. Complications were minimal, including pin site infections (10%) and neurovascular deficits (2%). Faster fracture healing (≤6 weeks) and anatomic alignment were associated with significantly better outcomes (p = 0.03 and p = 0.01, respectively). Conclusion: Closed reduction and percutaneous pinning with K-wires is a safe and effective technique for managing supracondylar humerus fractures in children. It ensures excellent functional recovery, particularly with crossed pin configurations, while minimizing complications. Early intervention, proper pin placement, and meticulous postoperative care are essential for optimal outcomes.