Route 15 is a state highway in the U.S. state of Connecticut that runs 83.53 miles (134.43 km) from a connection with New York's Hutchinson River Parkway in Greenwich, Connecticut, to its northern terminus intersecting with Interstate 84 (I-84) in East Hartford, Connecticut. Route 15 consists of four distinct sections: the Merritt Parkway, the Wilbur Cross Parkway, most of the Berlin Turnpike, and part of the Wilbur Cross Highway. The unified designation was applied to these separate highways in 1948 to provide a continuous through route from New York to Massachusetts. The parkway section of Route 15 is often referred to locally as "The Merritt".

The Hutchinson River Parkway is a controlled-access parkway in southern New York in the United States. It extends for 18.71 miles (30.11 km) from the Bruckner Interchange in the Throggs Neck section of the Bronx to the New York–Connecticut state line at Rye Brook. The parkway continues south from the Bruckner Interchange as the Whitestone Expressway (Interstate 678) and north into Greenwich, Connecticut, as the Merritt Parkway. The roadway is named for the Hutchinson River, a 10-mile-long (16 km) stream in southern Westchester County that the road follows alongside. The river, in turn, was named for English colonial religious leader Anne Hutchinson.