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Introduction: Cardiovascular diseases (CVDs) are known as a health-threatening factors and the most important cause of mortality worldwide and also in Iran. Thus, it seems necessary to intervene in order to increase public awareness of the risk factors and to enhance their motivation for reducing those factors via the theory-based education Objective: This study aimed to determine the effect of educational intervention based on health belief model on nutritional behavior of patients with myocardial infarction admitted to the hospitals in Guilan province during 1395-96( 2017-2018). Materials and Methods: This study is a randomized controlled experimental trial. Eighty-six patients with myocardial infarction were randomly assigned into two case (43) and control (43) groups. Data from both groups (demographic and health belief model and nutritional behavior) were collected using a researcher-made questionnaire before and a month after educational intervention. After fulfilling the requirements based on HBM, educational intervention took place in case group. Control group did not receive any kind of intervention, they just received the routine notes from hospital. Data were analyzed using SPSS version 21 using suitable statistical tests (chi-square test, Spearman coefficient and independent t-test). Results: In terms of demographic characteristics, no significant differences were seen between the groups. Before intervention, no significant differences were seen between mean scores of HBM constructs, awareness and nutritional behaviors in the groups, while after intervention there was a significant difference between them (p<0.001). Results also showed a significant difference in case group before and after receiving educational intervention (p<0.001). But there was no significant change in the control group before and after educational intervention (p<0.001). Conclusion: The present study showed that intervention based on HBM, emphasizing awareness and nutritional behavior of patients with myocardial infarction, could have a positive effect on the nutritional behavior of the patients and consequently their health status. [ABSTRACT FROM AUTHOR]