Objective: To investigate prevalence and predictors of postloss distress, depressive and anxiety symptoms, and quality of life among bereaved family caregivers of patients with advanced cancer.; Methods: Prospective multicenter study. Family caregivers (N = 160, mean age 56.8 years, 66% female) completed validated outcome measures (Distress Thermometer, Generalized Anxiety Disorder 7-item scale, Patient Health Questionnaire depression module 9-item scale, SF-8 Health Survey Questionnaire) 6 months after patient's discharge or death at specialist inpatient palliative care ward.; Results: Clinically relevant distress was observed in 82% with sadness (89%), exhaustion (74%), sleeping problems (68%), loneliness (53%), and sorrows (52%) being the most common distress-causing problems. Moderate/severe anxiety and depressive symptoms were observed in 27% and 35%, respectively. Compared to an adjusted norm sample, quality of life was significantly impaired with exception of "bodily pain" and physical component score. Preloss caregiving (odds ratio [OR] 2.195) and higher preloss distress (OR 1.345) predicted high postloss distress. Utilization of psychosocial support services (OR 2.936) and higher preloss anxiety symptoms (OR 1.292) predicted moderate/severe anxiety symptoms, lower preloss physical quality of life (OR 0.952), and higher preloss depressive symptoms (OR 1.115) predicted moderate/severe depressive symptoms.; Conclusion: Preloss mental burden showed to be a consistent predictor for postloss burden and should be addressed during palliative care. Future research should examine specific caregiver-directed interventions during specialist palliative care.