The Circumferential Highway is the common name for a freeway bypass around the city of Nashua in southern New Hampshire, most of which has not yet been built.

The only segment that has been built is a short 2-mile-long (3.2 km) freeway between US 3, the Daniel Webster Highway, and N.H. Route 3A.

The completed section begins at US 3, has a single interchange with the D.W. Highway, crosses the river, and terminates at NH Route 3A in Hudson.

The Sagamore Bridge crossing south of downtown Nashua was expanded and forms the only portion of the Circumferential Highway that has been constructed.

A 1993 report by the EPA expressed an "intent to veto" the project as it was then planned, all but killing the full highway.

Of particular concern is the impact on the Pennichuck Brook watershed, a series of ponds and creeks along the Nashua/Merrimack border.