en <span style=font-size:14px;><span style=unicode-bidi:embed><span new= roman= style=font-family: times=><b><span cambria= style=font-family:>Aims:</span></b><span cambria= style=font-family:> Preventive behaviors play an important role in reducing mortality caused by this disease. This study aimed to determine the application of the extended theory of planned behavior to predicting preventive behaviors against COVID-19.</span></span></span><br> <span style=unicode-bidi:embed><span new= roman= style=font-family: times=><b><span cambria= style=font-family:>Instrument & Methods: </span></b><span cambria= style=font-family:>In this descriptive-analytical cross-sectional study, 416 university students were selected and examined through virtual networks through convenience and snowball sampling methods. The data collection tool was developed by the researcher-made questionnaire based on the extended theory of planned behavior. Data were </span><span cambria= style=font-family:>analyzed using descriptive statistics and correlation test and linear regression by SPSS 18 software.</span><b><span style=font-family:Cambria,serif></span></b></span></span><br> <span style=unicode-bidi:embed><span new= roman= style=font-family: times=><b><span cambria= style=font-family:>Findings:</span></b><span cambria= style=font-family:> A positive and significant correlation was observed between the mean of all the studied theoretical constructs with preventive behaviors against COVID-19 (p<0.01). Attitudes, subjective norms, perceived behavioral control, and perception of others' behavior predicted 43% of behavioral intention variance. Moreover, behavioral intention perceived behavioral control and perception of others’ behavior predicted 56% of preventive behaviors variance against COVID-19. Behavioral intention, attitude, perception of others' behavior, subjective norms, and perceived behavioral control had the greatest impact on COVID-19 preventive behaviors. </span></span></span><br> <span style=unicode-bidi:embed><span new= roman= style=font-family: times=><b><span cambria= style=font-family:>Conclusion:</span></b><span cambria= style=font-family:> The extended theory of planned behavior can be used as an appropriate framework in designing educational interventions to promote preventive behaviors against COVID-19. </span></span></span></span> Theory of Planned Behavior,Students,COVID-19,Preventive,Behavior 83 88 http://hehp.modares.ac.ir/browse.php?a_code=A-10-65537-1&slc_lang=en&sid=4