Patient safety problems stemming from healthcare delivery constitute a global public health concern and represent a pervasive barrier to improving care quality and clinical outcomes.However, evidence generation into safety in mental healthcare, particularly regarding community-based mental health services, has long fallen behind that of physical healthcare, forming the focus of fewer research publications, and developed largely in isolation from the wider improvement science discipline. We argue that this disconnect yields, and is likely the product of, both conceptual and practical difficulties which must be overcome to advance the science and improvement of safety in mental health services. Drawing upon theoretical and empirical evidence from the fields of mental healthcare, patient safety, and improvement science, challenges encountered in our efforts to understand patient safety problems in community-based mental health services, a particularly unmapped area of safety, are described. We consider the origins of these issues and their probable implications for patient safety science and clinical care. Challenges in defining safety in the context of community mental healthcare, establishing what constitutes a 'preventable' safety problem, and the available evidence, are outlined. The dominant risk management approach to safety in mental healthcare, which positions service users as the origin of risk, has seemingly prevented a focus on proactive safety promotion, considering iatrogenic harm and latent system hazards. We propose a wider conceptualisation of safety and discuss important next steps for the integration and mobilisation of disparate sources of 'safety intelligence', to advance how safety is conceived and addressed within community mental healthcare.