Lygropia rivulalis, the bog lygropia moth, is a moth of the Crambidae family. It is found in North America, where it has been recorded from Arizona, California, Illinois, Indiana, Iowa, Kentucky, Maine, Maryland, Massachusetts, Michigan, Minnesota, New Hampshire, New Jersey, New York, North Carolina, North Dakota, Ohio, Oklahoma, Ontario, Pennsylvania, Quebec, South Carolina, Tennessee, West Virginia and Wisconsin. The habitat consists of boggy or wet areas.