Issue addressed: Sustainability of practice must be a central imperative in the practice of community-based health promotion to achieve population health and attract a greater share of public health spending. Although there has been some consideration of sustainability at the project or program levels, often understood as intervention longevity, very limited attention has been given to understanding sustainable practice. Methods: The present study develops a definition and features of sustainable practice in community-based health promotion through a Delphi method with health promotion practitioners in Queensland, Australia. Results: The study presents a consensus definition and features of sustainable practice. The definition highlights the importance of collaboration, health determinants and aspirations, processes and outcomes. The four features of sustainable practice identified in the study are: (1) effective relationships and partnerships; (2) evidence-based decision making and practice; (3) emphasis on building community capacity; and (4) supportive context for practice. Conclusions: The definition and features are, to a large extent, consistent with the limited literature around sustainability at the project and program levels of health promotion. Together, they provide insight into a form of community-based health promotion that will be both viable and productive.