Cass Canfield was an American publishing executive who was the longtime president and chairman of Harper & Brothers, later Harper & Row.
Canfield was the son of Augustus Cass Canfield (1854—1904), a wealthy engineer and yachtsman, and his wife, the former Josephine Houghteling. His stepfather was Frank Gray Gris wold, a relative of American bishop Frank Gris wold. He also was a great-grandson of Presidential candidate Lewis Cass. He had two sisters: Mary Cass Canfield and Laura Cass Canfield.