Self-disclosure is a process in which a person voluntarily and consciously reveals to others what he or she is feeling or thinking. It symbolizes the exchange of more intimate and confidential information, with the aim of social integration, but without specifically targeting others. Self-disclosure in young adulthood plays an important role in establishing relationships in close relationships and is assumed to be in relation to particular dimensions of attachment. Individual differences in self-discovery abilities may be explained by the different types of attachments a person acquires during his or her childhood. The study aimed to identify gender differences and differences to the target person in self-disclosure and to determine the relationship between attachment dimensions (avoidance and anxiety) and selfdisclosure. The study involved 89 subjects, of which 28 were men and 61 were women. The age range ranged from 18 to 24 years. The largest number of participants was 23 years old (33%). The study used the Self - disclosure Questionnaire SDQ, Jourard, 1971 as a measure of self - disclosure and the Modified Brennan Inventory of Close Relationships (Kamenov and Jelic, 2003) as a measure of attachment dimensions. The processing of the results shows that there is no difference in self-disclosure between men and women. Participants were also found to have significantly more self-disclosure than a friend to parent and partner, with no significant difference in self-disclosure to partner and friend. Furthermore, a significant negative association was found between the avoidance and self-disclosure dimensions in all three types of relationships. Which indicates that a high level of avoidance in all three types of close relationships is associated with a lower level of self-disclosure. In anxiety, no statistically significant association was obtained in two of the three types of relationship (parent and partner), whereas in a relationship with a partner, no significant negative association with self-disclosure was obtained. A high level of avoidance in relation to a partner is associated with a lower level of self-disclosure.