Mabel Costigan was an American community and church leader and advocate for labor laws for children and foreign-born individuals. Among her many social and political endeavors, she served on the advisory council of the National Child Labor Committee and was vice president of the National Consumers League.

The National Consumers League, founded in 1899, is an American consumer organization. The National Consumers League is a private, nonprofit advocacy group representing consumers on marketplace and workplace issues. The NCL provides government, businesses, and other organizations with the consumer's perspective on concerns including child labor, privacy, food safety, and medication information.