KT&G Corporation (Korean: 주식회사 케이티앤지), originally Korea Tobacco & Ginseng, is the leading tobacco company in South Korea with annual sales over US$4 billion. KT&G was originally a government-owned monopoly but was privatized and today is publicly traded, competing for market share with other international tobacco firms such as Philip Morris International, British American Tobacco, and Japan Tobacco.

KT&G also owns significant subsidiaries such as Korea Ginseng Corporation, Yungjin Pharm (a pharmaceuticals company), and several bio ventures. Its headquarters are in Daejeon.

KT&G produces popular Korean cigarette brands such as The One, Indigo, Arirang, This, This Plus, Zest, Esse, Raison, and Lo Crux. It has been expanded outside Korea, especially through its superslim brand Esse in Russia and other Eastern European markets.