The current study used an attachment framework to explore postrelationship rumination and adjustment. Young adults (N= 231) involved in a romantic relationship that (a) was of 3 months duration or longer and (b) ended in the last 12 months participated in the study. The study assessed rumination generally (brooding, regret, and reflection), and specifically concerning the ended relationship (relationship preoccupation and romantic regret). At the general level, brooding and regret were associated with more negative adjustment, whereas reflection was associated with more positive adjustment. At the relationship level, both relationship preoccupation and romantic regret were associated with more negative adjustment. Models tested indicated that rumination largely mediated the association between attachment anxiety and adjustment.