The 2019 ANA’s Principles for Nurse Staffing, Third Edition, identifies major elements needed to achieve appropriate nurse staffing, which enhances the delivery of safe, quality health care. These principles are grounded in the substantive and growing body of evidence that demonstrates the link between appropriate nurse staffing and better patient outcomes and apply to all types of nurse staffing at every practice level in any healthcare delivery setting. Focused on addressing the complexities of appropriate nurse staffing decisions, the principles and supporting material in this publication will guide nurses and other decision-makers in identifying and developing processes and policies needed to improve nurse staffing.