Malnutrition and frailty affect up to one-third of community-dwelling older adults in Australia and New Zealand (ANZ), burdening individuals, health systems and the economy. As these conditions are often under-recognised and untreated in the community, there is an urgent need for healthcare professionals (HCPs) from all disciplines to be able to identify and manage malnutrition and frailty in this setting. This paper describes the systematic and iterative process by which a practical guide for identifying and managing malnutrition and frailty in the community, tailored to the ANZ context, was developed. The development of the guide was underpinned by the Knowledge-to-Action Framework and included the following research activities: (1) a comprehensive literature review; (2) a survey of ANZ dietitians' current practices and perceptions around malnutrition and frailty; (3) interviews with ANZ dietitians; and (4) a multidisciplinary expert panel. This resulted in the development of a guide tailored to the ANZ context that provides recommendations around how to identify and manage malnutrition and frailty in the community. It is now freely available online and can be used by all HCPs across several settings. The approach used to develop this guide might be applicable to other conditions or settings, and our description of the process might be informative to others who are developing such tools to guide practice in their healthcare environment.