Introduction: The level of physical activity as a key factor of a healthy lifestyle is much less than required in women. Applying theories of behavioral change in regards to complex behaviors such as physical activity leads to identifying effective factors and their relations. The aim of this study is to survey determinants of exercise behavior based on the Theory of Planned Behavior in women residing in Tehran’s organizational townships.Method: This cross-sectional study was performed in 180 military staffs’ spouses residing in organizational houses, in Tehran, Iran (2014). The participants were randomly selected with a multi-stage cluster sampling method. Statistical analysis was carried out using SPSS16 and LISREL8.8.Results: The Theory of Planned Behavior model explained 77% of intentions and 17% of behavior variances. Subjective norm was the strongest predictor of intention. Also, the intention was the most effective determinant of behavior. The instrumental and affective attitude had no significant path. The direct relation of perceived behavioral control to behavior was non-significant.Conclusion: This research demonstrated relative importance and relationships of Theory of Planned Behavior constructs in physical activity of women residing in organizational houses. It is essential to consider these relations in designing educational interventions for promoting and sustaining exercise behavior.