Gary David Cohn (born August 27, 1960) is an American businessman and philanthropist who served as the 11th director of the National Economic Council and chief economic advisor to President Donald Trump from 2017 to 2018. He managed the administration's economic policy agenda. Before serving in the White House, Cohn was president and COO of Goldman Sachs, where he worked for more than 25 years. Cohn was appointed vice-chairman of IBM on January 5, 2021.

Following his White House service, Cohn became an advisor and venture capital investor for companies operating in the cybersecurity, blockchain infrastructure, and medical technology sectors. He is on the Board of Advisors for Hoyos Integrity, a startup company employing biometric blockchain technology for secure communications and digital payments, and vice chairman of IBM. Cohn is also the chairman of the advisory board at Pallas Advisors, a national security strategic advisory firm based in Washington, D.C.

Gary Cohn was born to an Eastern European Jewish family, the son of Victor and Ellen Cohn, and was raised in Shaker Heights, Ohio. His father was an electrician who later became a real estate developer. Cohn was diagnosed with dyslexia at a young age, and attended four schools by the time he reached sixth grade. His childhood experiences with dyslexia were a featured case study in the book David and Goliath by Canadian journalist Malcolm Gladwell. Cohn studied at Gilmour Academy for high school and graduated in 1979.

Cohn received a Bachelor of Science degree with a major in business administration from American University in 1982.

Cohn started his career at the U.S. Steel home products division in Cleveland, Ohio. After a few months, he left U.S. Steel and became an options dealer in the New York Mercantile Exchange. He taught himself the basics of options by reading about it in the days between meeting the hiring manager and joining the New York Mercantile Exchange.

Cohn was hired by Goldman Sachs in 1990 and became a partner at the firm in 1994. In 1996, he was named head of the commodities department, and in 2002, he was named the head of the Fixed Income, Currency and Commodities (FICC) division. In 2003, he was named co-head of Equities, and in January 2004, Cohn was named the co-head of global securities businesses. He became president and Co-Chief Operating Officer, and director in June 2006. While at Goldman Sachs, Cohn was also a member of the firm's board of directors and Chairman of the Firmwide Client and Business Standards Committee.

In 2010, Cohn testified to Congress on Goldman Sachs' role in the 2008 financial crisis. He testified: "During the two years of the financial crisis, Goldman Sachs lost $1.2 billion in its residential mortgage-related business. We did not 'bet against our clients', and the numbers underscore this fact."

On January 5, 2021, Cohn was appointed Vice Chairman of IBM's board of directors.