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Introduction: Attachment styles and defense mechanisms are personality features closely related to risk of psychological distress in healthy populations. However, their mutual interaction in influencing psychological distress is still unclear. Objectives: To explore the mutual interactions between denfense mechanism, attachment styles and psychological distress in a nonclinical sample. Methods: One-thousand-one-hundred-twenty-nine University students were evaluated using the Global Severity Index of Symptoms Check List 90-Revised for psychological distress, Relationship Questionnaire for attachment styles andDefense StyleQuestionnaire for defense mechanisms. Following exploratory analyses, a Path Analysis was performed with psychological distress as outcome. Results: Fearful and preoccupied attachment styles had a substantial impact on psychological distress. About 30% of their effect was mediated by Immature and Neurotic defenses, with the former having the major effect. Dismissing attachment showed no substantial effect on psychological distress. Secure Attachment and Mature Defenses had a small protective effect on psychological distress, but their inclusion in the path model did not improve overall goodness-of-fit. Attachment style and defense mechanisms accounted for nearly 25% of the variance in psychological distress. Conclusions: The results showed that attachment styles and defense mechanisms have a substantial impact on psychological distress. The effect of attachment style is mediated by defense mechanisms. Individual differences in attachment style and defense mechanisms represent risk factors for a psychological distress in young adults. [ABSTRACT FROM AUTHOR]