John Francis "Jack" Smith Jr. (born April 6, 1938) is an American businessman and executive who formerly served as COO in 1992, CEO from 1992 to 2000 and then chairman of the board of directors of General Motors from 1996 to 2000.

He joined General Motors as a payroll auditor in 1961, moving to its financial group in New York City in 1966. He went on to hold positions ranging from director of international planning to president of GM Canada, president of GM Europe and head of international operations.

He later served as non-executive chairman of the board of directors of Delta Air Lines from 2004 to 2007. He also served as member of board of Procter & Gamble from 1995-2008 and also Suzuki Motor Corporation.

He received his Bachelor of Business Administration from the University of Massachusetts Amherst in 1960 and his Master of Business Administration from Boston University in 1965.