Wellesley is a town in Norfolk County, Massachusetts, United States. It is part of Greater Boston. The population was 27,982 at the time of the 2010 census. It is best known as the home of Wellesley College, Babson College, and a campus of Massachusetts Bay Community College. While most of Olin College, a private engineering school, is in the town of Wellesley, its main entrance is located in Needham, Massachusetts.