With mental illness remaining a significant burden of disease, there is an ongoing need for community-based health promotion, prevention, and responses (or "mental health promotion activities"). The health promotion, community development, and positive psychology literature identifies significant heterogeneity in the design and delivery of these activities. This variability spans: (1) individual vs. group outcomes, (2) psychological vs. sociological determinants of change, (3) promoting wellbeing vs. reducing mental health symptoms, and (4) the degree activities are contextualized vs. standardized in design and delivery. Mental health promotion activities do not easily accomplish this level of complexity within design and implementation. This has led to the emergence of the complexity-informed health promotion literature and the need for innovative tools, methods, and theories to drive this endeavor. This article directly responds to this call. It introduces "wellbeing-responsive community": a vision and outcome hierarchy (or growth target) for intentionally delivered mental health promotion. The construct enables the design and implementation of interventions that intentionally respond to complexity and contextualization through the drivers of co-creation, intentionality, and local empowerment. It represents a community (support team, programme, agency, network, school, or region) that has the shared language, knowledge, methods, and skills to work together in shared intent. In other words, to integrate best-practice science with their local knowledge systems and existing strengths, and intentionally co-create and deliver contextualized wellbeing solutions at both the individual and community levels that span the "system" (e.g., whole-of-community) to the "moment" (e.g., intentional support and care). Co-creation, as applied through a transdisciplinary lens, is emerging as an evidence-based method to respond to complexity. This article describes the rationale and evidence underpinning the conceptualization of a wellbeing-responsive community through the integration of three key disciplines: (1) positive psychology, (2) ecological or systems approaches, and (3) intentional practice (implementation science). A definitional, contextual, and applied overview of the wellbeing-responsive community is provided, including a hierarchy of outcomes and associated definitions. Its purported application across education, mental health, community service, and organizational settings is discussed, including its potential role in making complexity-informed health promotion practical for all knowledge users.