Background:
Volleyball is associated with a high prevalence of musculoskeletal injuries. While biomechanical and training-related risk factors are well established, psychological characteristics and sleep quality remain insufficiently explored in volleyball athletes.

Aim:
This study aimed to determine the six-month injury prevalence among Iranian volleyball players and to examine associations between injury occurrence and obsessive passion, sleep quality, demographic variables, training characteristics, and foot-arch type.

Materials and Methods:
In this cross-sectional study, 146 Iranian volleyball players aged 18–40 years completed an online questionnaire. Information was collected on demographic characteristics, training habits, foot-arch type, obsessive passion, sleep quality, and self-reported injuries sustained during the previous six months. Injury prevalence and anatomical distribution were summarized descriptively. Univariate and multivariable logistic regression analyses were performed to identify factors associated with injury occurrence.

Results:
Overall, 50.7% of players reported at least one injury. Low back pain (31.3%) and ankle sprains (26.2%) were most common. Male sex, higher obsessive passion, poorer sleep quality, training sessions longer than 90 minutes, and pes planus were significantly associated with injury.

Conclusion:
Volleyball injuries demonstrate a multifactorial pattern involving psychological, recovery-related, and biomechanical factors, supporting their inclusion in future prospective injury research.