This study aims to examine posttraumatic growth and its associations with parental bereavement among adolescents and young adults. Fifty-five young adults who had lost a parent to cancer at least 2 months earlier and were about to attend a support group at a palliative care service were recruited. Data was collected through questionnaires before support group participation, about 5–8 months after the loss and at a 6-month follow-up, about 14–18 months after the loss. The result shows that the young adults experienced posttraumatic growth, mostly in the domains Personal strength and Appreciation of life. Posttraumatic growth was associated with bereavement outcomes, especially life satisfaction, a feeling of meaning in future life and psychological health. The result is of value for health care professionals as it adds information about the importance of supporting constructive rumination to enhance the possibility to positive psychological change after a parent’s death.