Harold Gregg Lewis (May 9, 1914 – January 25, 1992) was an American economist notable for his contributions in labor economics. He was considered a principal member of the monetarist, free-market-oriented Chicago school of economics. A native of Homer, Michigan, Lewis earned his bachelor's degree and Ph.D. from the University of Chicago. He stayed as a faculty member until 1975, when he moved to Duke University.