The Second Cambridge Savings Bank Building is an historic bank building at 11–21 Dunster Street in Cambridge, Massachusetts. The Italian Renaissance masonry building was built in 1897 by the Cambridge Savings Bank. It is a four-story building, with a frieze of fleur-de-lis patterning separating the first floor from the upper floors, and a metal cornice below the roof. The building corners are quoined on the upper levels, and there are a pair of matching entrances. It is one of the finest examples of pre–World War I architecture in Harvard Square.
The building was listed on the National Register of Historic Places in 1983, and included in an expansion of the Harvard Square Historic District in 1988.