Commonwealth Avenue (colloquially referred to as Comm Ave by locals) is a major street in the cities of Boston and Newton, Massachusetts. It begins at the western edge of the Boston Public Garden, and continues west through the neighborhoods of the Back Bay, Kenmore Square, Allston, Brighton and Chestnut Hill. It continues as part of Route 30 through Newton until it crosses the Charles River at the border of the town of Weston.
Often compared to Georges-Eugène Haussmann's Paris boulevards, Commonwealth Avenue in Back Bay is a parkway divided at center by a wide grassy mall. This greenway, called Commonwealth Avenue Mall, is punctuated with statuary and memorials, and forms the narrowest "link" in the Emerald Necklace. It connects the Public Garden to the Fens.