Clarence Arthur Perry (March 4, 1872 – September 6, 1944[1]) was an American urban planner, sociologist, author, and educator.
He later worked in the New York City planning department where he became a strong advocate of the neighborhood unit.
During World War I he served overseas as a major then returned in 1924 as a lieutenant colonel in the reserves.
As a staff member of the New York Regional Plan and the City Recreation Committee, Perry formulated his early ideas about the neighbourhood unit and community life.
He produced several books, many pamphlets and articles though is best remembered for his The Neighborhood Unit (The Neighbourhood Unit: From the Regional Survey of New York and Its Environs, Volume VII, Neighbourhood and Community Planning, 1929) and Housing for the Machine Age (1939).