Background: With the pervasive use of smartphones among university students, there has been a growing concern about its impact on physical health, particularly neck pain. Prolonged use of these devices often leads to poor posture, potentially resulting in musculoskeletal issues. Objective: The study aimed to investigate the association between smartphone usage and the prevalence of neck pain among university students, considering variables such as duration of usage, posture, and the frequency of smartphone-related activities. Methods: This cross-sectional study involved 353 students from the University of Sialkot. Participants were selected using non-probability purposive sampling. Data were collected using the Smartphone Addiction Scale (SAS) and the Copenhagen Neck Disability Index (CNDS). Statistical analyses, including descriptive and inferential statistics, were conducted using SPSS software version 25. Results: The study found that 95.6% of participants reported neck pain attributable to smartphone use. Women reported higher smartphone usage (6.9 hours/day) compared to men (5.6 hours/day). A strong positive correlation (Pearson Correlation: .263, p<.000) was observed between the duration of smartphone use and the intensity of neck pain. The seated position was associated with more reported pain (0.111%) compared to standing or walking positions (0.095%). Conclusion: The research highlights a significant correlation between extensive smartphone use and the prevalence of neck pain in university students. This association underscores the need for educational initiatives and ergonomic solutions to address and prevent neck pain related to smartphone usage.