Massachusetts Libraries
- Directory of library websites includes state, public and academic.
- http://www.librarysites.info/states/ma.htm

State Library of Massachusetts
- Includes information on genealogy, legislative history, special collections, and legal research resources.
- http://www.mass.gov/lib/

Berkshire Athenaeum Library Catalog
- Collection offers histories for nearly every town in the Commonwealth, with a focus on the Berkshires and western Massachusetts.
- http://www.berkshire.net/PittsfieldLibrary/search.html

Southeastern Massachusetts Library System
- Established to promote resource sharing among member institutions.
- http://www.semls.org/

Northeast Massachusetts Regional Library System
- Community of academic, public, school and special libraries and media centers which collaborates to share resources.
- http://www.nmrls.org/

Boston Library Consortium
- Cooperative association of sixteen academic and research libraries which supports resource sharing and enhancement of services through programs.
- http://www.blc.org/

Massachusetts Library and Information Network (MLIN)
- Gateway to information about libraries in Massachusetts, including detailed directory information, library homepages and special services.
- http://mlin.lib.ma.us/