This document is the introduction to the WHO Patient Safety Curriculum Guide: Multi-professional Edition. It discusses how patient safety has become a global priority in healthcare over the past 20 years since influential reports highlighted that errors are common in healthcare and can cause serious harm. It recognizes that while efforts have been made to improve patient safety, unsafe care remains a concern worldwide. It presents the Curriculum Guide as a new approach to strengthening the education of healthcare professionals in patient safety principles and practices to help address ongoing safety challenges.