Background and Objectives: Rhabdomyolysis is a disorder in which skeletal muscle tissues are damaged, resulting in the escape of their internal substances into the blood circulation. Acute kidney injury (AKI) is a serious complication of rhabdomyolysis that necessitates early recognition to ensure effective clinical management. The objective of this research was to create a practical scoring tool for forecasting AKI in patients experiencing rhabdomyolysis due to trauma or excessive exercise. Materials and Methods: A novel scoring system, termed the growth differentiation factor-15-trauma-creatine kinase acute kidney injury score (GDF-TRACK-AKI score), was established. The model integrates serum levels of growth differentiation factor-15 (GDF-15), creatine kinase (CK), and occurrence of rhabdomyolysis associated with trauma. Clinical and biochemical data were prospectively collected, and the model’s predictive performance was evaluated using receiver operating characteristic ROC curve analysis. Results: Among patients with rhabdomyolysis, those who developed AKI had significantly higher GDF-TRACK-AKI scores (median: 3.00 (IQR: 2.00)) compared to patients without AKI (median: 0.48 (IQR 0.89); p < 0.001). Serum CK and GDF-15 levels were also markedly elevated in the AKI group (p < 0.001). ROC analysis identified a cut-off value of 2.5, providing 67% sensitivity and 98% specificity. Patients with scores ≥ 2 demonstrated a significantly increased risk of AKI. Conclusions: Designed as a practical and dependable tool, the GDF-TRACK-AKI score facilitates prompt identification of kidney injury in patients whose rhabdomyolysis is linked to either trauma or vigorous activity. The integration of trauma history with GDF-15 and CK biomarker data improves risk stratification precision and supports timely treatment decisions. To verify its practical utility and prognostic capabilities, the GDF-TRACK-AKI score should undergo additional evaluation across expansive and demographically varied clinical populations.