Background: Prognostic awareness, a measure of patients’ cognitive and emotional perception of their illness and prognosis, allows individuals to align their medical decision-making with their goals and values. Prior studies have shown mixed findings regarding the relationship between prognostic awareness with better quality of life (QOL) and less psychological distress in patients with advanced cancer. However, studies have not investigated whether it is the cognitive or the emotional aspects of patients’ awareness of their prognosis that are associated with QOL and psychological distress in patients with advanced cancer. Methods: We conducted a cross-sectional study of patients with metastatic solid malignancies not being treated for curative intent at a single academic center from 11/2019-6/2022. We used the Prognostic Awareness Questionnaire (PAIS) to measure the cognitive (i.e., the capacity to understand one’s prognosis characterized by the accurate perception that a cancer is curable or not) and emotional coping with prognosis (i.e., the capacity to emotionally process prognostic uncertainty and terminal prognosis). We used the Functional Assessment of Cancer Therapy-General (FACT-G), Hospital Anxiety and Depression scale (HADS), and the Peace, Equanimity and Acceptance in the Cancer Experience (PEACE) scale to measure, QOL, psychological distress, and acceptance of illness, respectively. We used multivariate regression models controlling for age, gender, and cancer type to assess the relationship between the cognitive and emotional prognostic awareness domains and patient-reported outcomes. Results: Overall, 632 participants (age 65 years (SD=11.3), 51% female, 76% married or living with a partner) were enrolled in the study. In multivariate models, higher cognitive understanding of prognosis was not associated with QOL (b=-2.134; p=0.069), psychological distress (i.e., anxiety: b=0.331; p=0.232 and depression; b=0.233; p=0.368), or peaceful acceptance of terminal illness (b=-0.045; p=0.838). However, emotional coping of prognosis was associated with better QOL (b=1.981; p<0.001), less anxiety (b=-0.516; p<0.001) and depression (b=-0.370; p<0.001) symptoms, and more peaceful acceptance of terminal illness (b=0.438; p<0.001). Conclusions: Patients’ emotional coping with their prognosis, rather than their cognitive understanding of their terminal prognosis, was associated with their QOL, psychological distress, and acceptance of their illness. These findings underscore the importance of examining prognostic awareness and its association with patient-reported outcomes by domains. We also highlight the need to develop supportive care interventions to promote effective coping strategies for patients after prognostic disclosure.