Louis V. Gerstner, Jr. KBE (born March 1, 1942 in Mineola, New York) was chairman of the board and chief executive officer of IBM from April, 1993 until 2002 when he retired as CEO in March and chairman in December. He is largely credited with turning around IBM's fortunes.

He was formerly CEO of RJR Nabisco, and also held senior positions at American Express and McKinsey & Company. He is a graduate of Chaminade High School, Dartmouth College and holds an MBA from Harvard Business School.

In January, 2003, he assumed the position of chairman of The Carlyle Group, a global private equity firm located in Washington, DC.