In 2015, the Department of Health and Human Services released the National Health Security Strategy (NHSS) and Implementation Plan, 20152018, outlining a vision for the nations health security. The strategy and plan aim to minimize the health consequences of emergency incidents and disasters such as extreme weather, deadly epidemics, hazardous material catastrophes, and terrorist attacksby supporting the local and national promotion of community health and resilience. The National Association of County and City Health Officials (NACCHO) developed this strategic messaging guide as a resource for local health officials to advance national health security in the communities they serve. This guide provides local health department (LHD) staff with readily accessible mechanisms to effectively communicate with media outlets and other stakeholders about national health security and its connection to ongoing public health activities. This guide includes themes and messages that clearly illustrate the importance of health resiliency for communities across the nation. As a result, it will help LHDs craft impactful messages that speak to the concerns of audiences within their communities and convey the steps they are taking to make their communities more resilient.