Abstract: Even though mechanical life is presently the source of valuable services to mankind, it has been faced with many complications including musculoskeletal disorders, different kinds of diseases and Progeria due to unfavorable working conditions. Several factors such as the type of work load, load carrying, physical and psychological factors and duration of work affect occupational low back pain. Repetitive work, load carrying can be found in auto parts manufacturing industries. If indeed occupational and personal factors can make a person susceptible to back pain, it is important to conduct studies in this field. The aim of this analytical-descriptive study was to evaluate the relationship between individuals and occupational factors with low back pain in one of the automobile parts manufacturing workshops in Tehran. For this reason, 160 personnel of different units were randomly sampled. Nordic questionnaire was used to evaluate the prevalence of low back pain. Then, data were analyzed using SPSS Version 16. The results showed that 27.5% of workers studied suffered from back pain. χ2-test results showed that there was a significant relationship between exercise, experience and the prevalence of back pain. A high percentage of young workers suffered from low back pain, it was expected that increased experience had increased the incidence of back pain.