A Oncology Certified Nurse (OCN®) is a registered nurse who has specialized knowledge and certification in cancer care. This credential, awarded by the Oncology Nursing Certification Corporation (ONCC), recognizes expertise in areas such as cancer prevention, treatment, symptom management, and patient support. OCNs provide high-quality, evidence-based care to patients across the cancer continuum, from diagnosis through survivorship or end-of-life care.