Massachusetts Archaeological Society
- Non-profit organization dedicated to preserving and studying the state's archaeological heritage. Aims, achievements, news, chapters and museum.
- http://www.massarchaeology.org

Bay State Historical League
- Nonprofit association of individuals and organizations committed to promoting the enjoyment of history through its preservation, interpretation and presentation.
- http://www.masshist.org/masshistory/

Massachusetts Historical Commission
- State historic preservation office authorized to identify, evaluate and protect the Commonwealth's important historic and archaeological resources.
- http://www.sec.state.ma.us/mhc/mhcidx.htm

Massachusetts Society of Mayflower Descendants
- Dedicated to honoring the memory of members' Mayflower ancestors and to collecting, preserving and communicating the history and genealogy of those Passengers and their descendants.
- http://www.massmayflower.org/

The Colonial Navy of Massachusetts
- Revolutionary War naval militia which came into being on December 29, 1775. It is currently an active membership organization. Historical overview and membership information provided.
- http://www.cnm1775.org/

Massachusetts Historical Societies
- Directory of history and historical society web sites in the state.
- http://www.masshome.com/histsoc.html

The Trustees of Reservations
- Conservation organization which oversees several cultural and scenic properties in Massachusetts.
- http://www.berkshireweb.com/trustees/index.html

Massachusetts Historical Society
- Major research library and manuscript repository with rare documents and artifacts, including the pen that Abraham Lincoln used to sign the Emancipation Proclamation. Collects, preserves and communicates historical information about Massachusetts.
- http://www.masshist.org/

Massachusetts Society of the Sons of the American Revolution
- State chapter of nationwide membership organization which promotes American history and the war for independence in particular.
- http://www.massar.org/