The purpose of this toolkit from Middlesex-London Health Unit in Ontario is to assist public health professionals, provide valid, reliable and standardized input that supports active community design when reviewing development plans submitted to a municipality. The toolkit was developed primarily for public health professionals to use; however, other professionals such as planning, design, transportation, transit, engineers, parks and recreation and developers may be interested in utilizing this toolkit to ensure and/or advocate for the design of active communities. Moreover, federal, provincial and municipal government representatives and staff may be interested in the types of elements and criteria included in the toolkit in order to develop overarching policies (e.g. legislation, Official Plan policies) that support the development of active communities across Canada. The overall goal of the Active Community Toolkit is to increase opportunities for active living including active transportation within the built and natural environments. This will be accomplished by increasing the number and type of active community design elements contained within development plans.