Westwood is a town in Norfolk County, Massachusetts, United States. The population was 14,618 at the 2010 census. In July 2005, CNN/Money and Money magazine ranked Westwood 13th on its list of the 100 Best Places to Live in the United States. Boston Magazine included Gay Street in Westwood on its list of the Best Streets in the Boston area. It is currently the 17th wealthiest town in Massachusetts.
According to the United States Census Bureau, the town has a total area of 11.1 square miles (29 km2), of which, 11.0 square miles (28 km2) of it is land and 0.2 square miles (0.52 km2) of it (1.35%) is water.
As of the census of 2000, there were 14,117 people, 5,122 households and 3,867 families residing in the town. The population density was 1,286.7 people per square mile (496.9/kmē). There were 5,251 housing units at an average density of 478.6/sq mi (184.8/kmē).