This is a list of roundabouts in the state of Massachusetts in the United States. Intersections that are called traffic circles or roundabouts in the rest of the US are referred to as "rotaries" in Massachusetts, as well as other parts of New England including parts of Connecticut, New Hampshire, Maine Rhode Island, & Vermont.
In 2017 the MassDOT announced that it was eliminating rotaries in favor of Roundabouts. In 2020 it issued guidance on the design and planning for roundabouts.
City of Boston
Sullivan Square (Interstate 93/U.S. Route 1, Massachusetts Route 99, Massachusetts Route 38 Alford St., and Main St.) in Charlestown, Boston Orient Heights (Saratoga St., Boardman St., and Ford St) in East Boston Old Colony Rotary in South Boston Columbia Point Rotary (Southeast Expressway:Interstate 93/U.S. Route 1/Massachusetts Route 3) Neponset Circle (Southeast Expressway:Interstate 93/U.S. Route 1/Massachusetts Route 3, Morrissey Boulevard and Massachusetts Route 203) in Dorchester, Boston Morrissey Boulevard in Dorchester, Boston Hyde Square (Centre Street, Day Street, Perkins Street) in Jamaica Plain General Heath Square (Heath Street, Parker Street, Wensley Street, New Heath Street) in Jamaica Plain
City of Cambridge
Alewife Brook Parkway (Massachusetts Route 2, Massachusetts Route 16, and US Route 3) with Concord Ave, in West Cambridge, in a rotary interchange built in a small space. Dawes Island Park Massachusetts Avenue (Massachusetts Route 2A) Peabody, and Garden Streets in Harvard Square, in an elongated configuration due to portal into Harvard Square Bus Tunnel Fresh Pond Parkway (Massachusetts Route 2, Massachusetts Route 16, and US Route 3) with Concord Ave, in West Cambridge, in a rotary interchange built in a small space. Memorial Drive (U.S. Route 3) & Boston University Bridge (Massachusetts Route 2), Cambridge, Massachusetts, in a rotary interchange built in a small space.