This article presents a simple conceptual road map for implementing a just culture in healthcare settings. The concept of just culture was developed as one of five fundamental elements of a safety culture by psychology professor James Reason in 1997. A just culture requires an unbiased method of judging human error and is designed to develop organisational trust so that adverse medical events (errors) are reported and corrected before they combine with other errors to cause injury or death. To implement a just culture properly so as to increase organisational safety, practitioners must understand its role in enabling the error reporting needed to develop a safety culture. This article reviews these foundational concepts and explores the human causes of errors that a just culture addresses, the psychological importance of a just culture in enabling error reporting and how to implement a just culture in organisations.