Introduction: More than 60% of the office staff in developing countries complain about physical discomfort that many of the discomforts associated with musculoskeletal disorders. The prevalence of musculoskeletal disorders among developing countries, according to the type and duration of work with computers, between 15 to 70% has been reported. The aim of this study was to evaluate musculoskeletal disorders in computer users and determination of correlation between the results of CMDQ, RULA and ROSA methods.
 Materials & methods: Participants were 71 office users that were selected using systematic random sampling. The method used in this correlation study was using CMDQ questionnaire and evaluation of those methods.
 Findings: According to the final results of the RULA 46% of participants were in risk level 3 and 4 (ergonomic intervention) and results of the ROSA 21% as low risk, 48% as medium risk and 31% were at high risk. Also there is a significant relationship between the risk level of two method results (p<0.05).
Discussion & Conclusion: Two evaluation methods have a high correlation to estimated risk levels of musculoskeletal disorders and they can be used as an alternative method to assessment of ergonomic risk of office environments.