汉斯·阿道夫·克雷布斯（Hans Adolf Krebs，1900年8月25日－1981年11月22日），医生、生物化学家，原籍德国，后移民英国。克雷布斯在代谢方面有两个重大发现：尿素循环和三羧酸循环。三羧酸循环是三大营养素（糖类、脂类、氨基酸）的最终代谢通路，又是糖类、脂类、氨基酸代谢联系的枢纽，因此也被称为克雷布斯循环、克氏循环（Krebs cycle）。他与弗里茨·阿尔贝特·李普曼一同获得1953年的诺贝尔生理学或医学奖。

Sir Hans Adolf Krebs (English /krɛbz/ or /krɛps/) (25 August 1900 – 22 November 1981) was a German-born British physician and biochemist. He was the pioneer scientist in study of cellular respiration, a biochemical pathway in cells for production of energy. He is best known for his discoveries of two important chemical reactions in the body, namely the urea cycle and the citric acid cycle. The latter, the key sequence of metabolic reactions that produces energy in cells, often eponymously known as the "Krebs cycle", earned him a Nobel Prize in Physiology or Medicine in 1953. With Hans Kornberg, he also discovered the glyoxylate cycle, which is a slight variation of the citric acid cycle found in plants, bacteria, protists, and fungi.