The Maine Charitable Mechanic Association is a private non-profit organization located in Portland, Maine, United States. Founded in 1815, it has since 1859 been headquartered at Mechanics' Hall, 519 Congress Street, in the center of Portland. The library's hours are Tuesday through Thursday from 10:00 a.m. to 3:00 p.m., Friday from 4:00 p.m. to 7:00 p.m., and Saturday from 10:00 a.m. to 1:00 p.m.