The Massachusett are a tribe of Native Americans who live in areas surrounding Massachusetts Bay in what is now the Commonwealth of Massachusetts, in particular present-day Greater Boston; they spoke the Massachusett language.

The present-day U.S. state Massachusetts is named after the tribe.Alternate forms are Moswetuset, as in the Moswetuset Hummock where Myles Standish and Squanto first met Chief Chickatawbut in 1621, and Massachusit, as in the Massachusit Fields where Captain Richard Wollaston brought the first settlers of Quincy Massachusetts in 1624.

"Massachusett" translates from Algonquian as "The people who live near the great hill", while "Moswetuset" translates to "The hill shaped like an arrowhead".

The former is thought to refer to the Blue Hills located south of Boston, while the latter most definitely refers to the Moswetuset Hummock.One of the first groups of indigenous American peoples to encounter English colonists, their numbers were quickly depleted, although descendants continue to inhabit the Greater Boston area.

The Massachusett belong to the Algonquian family of peoples.