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Background: Mental disorders currently impose a significant health and economic burden in both developed and developing countries. The relationship between  nutrition and mental disorders has been increasingly of interest in recent years. So, we aimed to evaluate the association between diet quality index international (DQI-I) and anxiety. Materials and Methods: This is a cross-sectional study which was conducted on 194 men and women (to perform routine examinations before marriage, that were randomly selected). Sociodemographic and  anthropometric indices, dietary intake (using FFQ) and  mental health (using a short version of the self-report depression, anxiety, and stress scale questionnaire ,DASS-21) were measured. Results: Univariate and multivariate linear regression of anxiety and diet quality index score showed significant association for diet quality index score and anxiety in all participants.Diet quality index score was inversely associated with anxiety in all participants, male and female.Adjustmentsfor age, education, income, job, smoking, physical activity, and BMI did not change the aforementioned associations. Conclusion: In this study, a significant associationwas observed between diet quality and the risk of mental disorders.An increase in the index of dietary quality in humans caused a significant reduction in the level of anxiety.