James William Guercio (born 1945 in Chicago, Illinois) is an American music producer, musician and songwriter (occasionally credited as Jim Guercio), and is probably best known for his work as the producer of Chicago's early albums as well as early recordings of The Buckinghams and Blood Sweat & Tears. He also has worked briefly in the motion picture industry as a producer and director. Guercio was also a member of The Beach Boys in the mid-1970s.