Non-specific neck pain (NSNP) is a common musculoskeletal condition that significantly affects quality of life, daily activities, and work productivity. Although various physical, postural, and psychosocial factors have been associated with NSNP, the role of body composition in pain and functional outcomes remains unclear. Emerging evidence suggests that muscle and fat mass may influence musculoskeletal pain and related dysfunctions; however, studies examining these relationships in individuals with NSNP using objective measurements are limited. The purpose of this study is to investigate the effects of body composition on pain threshold, posture, cervical range of motion, sensation, and cervical function in individuals with non-specific neck pain. Individuals diagnosed with NSNP will be recruited from the Physical Medicine and Rehabilitation outpatient clinic. Participants' body composition, pain threshold, posture, cervical range of motion, sensory function, and cervical disability will be assessed using validated and objective measurement tools. Understanding the relationship between body composition and cervical outcomes in individuals with non-specific neck pain may contribute to early identification of risk factors and support the development of more targeted and effective physical therapy and rehabilitation strategies.