Marshall Field III was an American investment banker, publisher, racehorse owner/breeder, philanthropist, grandson of businessman Marshall Field, heir to the Marshall Field department store fortune, and a leading financial supporter and founding board member of Saul Alinsky's community organizing network Industrial Areas Foundation.

Marshall Field was an American entrepreneur and the founder of Marshall Field and Company, the Chicago-based department stores. His business was renowned for its then-exceptional level of quality and customer service.