Self–disclosure is an act of intimacy and serves as a maintenance strategy, and yetvery little prior research has examined self–disclosure within relationships withdata collected multiple times over an extended period of time and from both partners. With longitudinal data collected from both partners in young adult datingcouples, we examined how self–disclosure is associated with both individual characteristics (e.g., responsiveness, self–esteem) and relationship characteristics (satisfaction, love, commitment). Overall, men and women indicated a similar highlevel of self–disclosure. As hypothesized, positive associations were found between self–disclosure and the individual characteristics of self–esteem, relationship esteem (confidence as an intimate partner), and responsiveness (as indicatedby data collected at Time 1). Self–disclosure also was positively associated with relationship quality (satisfaction, love, and commitment). Similar positive associations were typically found at the follow–up waves, although in many cases thecorrelations were not significant and were more modest in magnitude. Level ofself–disclosure was generally not predictive of whether the couple stayed togetheror broke up over time, although the more that women perceived their partner disclosed at Time 1, the less likely the couple was to break up by Time 2. It is speculated that the generally high level of self–disclosure at Time 1 for the entire samplelimited the degree to which self–disclosure could predict which relationships