Wetlands are disappearing due to development and expansion of agricultural lands, and are declining in quality due to pollution and climate change impacts. Yet wetlands are valuable parts of the landscape that provide human and environmental benefits, including improved water quality, flood mitigation, and habitat for a diverse array of plant and animal species. Wetlands also provide outstanding opportunities for outdoor recreation, including birding, hunting, boating, and fishing. The Marsh Monitoring Program is a long-term program that engages professional and citizen scientists in the collection of scientifically robust data. It operates across regions of Canada where marsh-breeding birds or frogs/toads are most abundant and diverse and under threat. The main outcomes are information on marsh bird (Great lakes and Québec) and frog and toad (Great Lakes only) population trends and sizes and relationships with habitat, along with raising awareness of the importance of wetland conservation with the public. The Marsh Monitoring Program uses these outcomes to directly inform and guide conservation, restoration, and management of marshes and their inhabitants for the benefit of wildlife and people. The program continually develops and expands and is considered a trusted source for marsh bird, frog/toad, and habitat data in North America.