Nurses have a primary role in providing palliative and end-of-life (EOL) care. Their knowledge of EOL care, attitudes toward care of the dying, and palliative care self-efficacy are important in care delivery. Little is known regarding palliative care preparedness among Mongolian nurses. This study examines palliative care knowledge, attitude towards death and dying, and self-efficacy among Mongolian nurses, and examines predictors of self-efficacy. A cross-sectional descriptive study was conducted. Participants were 141 nurses employed at the National Cancer Center in Mongolia. Data was collected using a self-administered questionnaire. The median score for the knowledge of palliative care was 8.0/20. "Psychosocial and spiritual care" was the lowest score on the palliative care knowledge subscale. The mean score for attitude toward care of the dying was 69.1%, indicating positive attitudes. The mean score for the palliative care self-efficacy was 33.8/48. Nurses reported low self-efficacy toward communicating with dying patients and their families, and managing delirium. Palliative care knowledge and duration of experience as an oncology nurse significantly predicted self-efficacy toward palliative care, accounting for 14.0% of the variance. Palliative education for nurses should address the knowledge gaps in EOL care and focus in increasing palliative care self-efficacy. Considering palliative care knowledge and nursing experience as an oncology nurse were significant predictors of self-efficacy toward palliative care, more effort is needed to fill the knowledge gaps in EOL care among nurses, especially for less experienced nurses.