The Oncology Nursing Society (ONS) is a professional organization in the United States dedicated to promoting excellence in oncology nursing and quality cancer care. It was founded in 1975 and has grown to become the largest professional association for oncology nurses in the world, with more than 35,000 members.

• The ONS provides a wide range of resources and support to its members, including educational opportunities, networking events, advocacy efforts, and clinical practice guidelines. The organization also offers a number of certification programs for oncology nurses, including the Oncology Certified Nurse (OCN) credential.
• In addition to its work with individual nurses, the ONS also collaborates with other healthcare organizations, government agencies, and patient advocacy groups to advance the field of oncology nursing and improve the lives of cancer patients.
• The ONS is headquartered in Pittsburgh, Pennsylvania, and has regional chapters and special interest groups throughout the United States. The organization is governed by a Board of Directors, which is elected by its members, and has a staff of professional employees who carry out its day-to-day operations.
• Overall, the Oncology Nursing Society plays a critical role in supporting and advancing the practice of oncology nursing in the United States, and is a valuable resource for both individual nurses and the healthcare industry as a whole.