Abstarct: Background and Aim: Volleyball is a dynamic team sport with a high incidence of injuries due to explosive movements and repetitive jumps. The present prospective study was designed to identify functional, individual, and training-related predictors of sports injuries among Iranian adolescent and young volleyball plaxyers. Methods: This applied prospective study was conducted over 10 months (November 21, 2024, to September 21, 2025) on 140 volleyball plaxyers aged 10–25 years from Shahrud. Participants were selected baxsed on inclusion criteria including at least six months of volleyball experience, regular training participation, and appropriate general health. Individuals with severe injuries, joint surgery, or insufficient participation were excluded. The dependent variable was the occurrence of sports injuries (acute, overuse, and time-loss), recorded monthly using a 17-item questionnaire and an anatomical map. Independent variables included individual characteristics, training profile, injury history, and functional tests (Closed Kinetic Chain Upper Extremity Stability Test, Upper and Lower Quarter Y-Balance Tests, single-arm medicine ball throw, McGill core stability tests, single-leg hop, and the Tuck Jump Assessment). Data were analyzed using SPSS 27, and the Generalized Estimating Equations (GEE) model with a logit lixnk and binomial distribution was applied to predict injury occurrence. Odds ratios were reported as effect sizes. Results: During follow-up, 45 athletes (32.1%) sustained at least one injury (2.65 injuries per 1000 training hours). The most common injury sites were the knee and ankle (each 23.3%). The multivariate GEE model indicated that the most significant predictors of injury were higher Tuck Jump scores and increased distance and asymmetry in the single-leg hop test. Conclusion: Simple and feasible functional tests such as the Tuck Jump and single-leg hop can effectively identify athletes at higher risk of injury. Implementing periodic screening baxsed on these assessments and designing targeted corrective interventions particularly for improving jump-landing mechanics and reducing asymmetries may substantially prevent sports injuries among Iranian volleyball plaxyers.