乙酰磺胺酸钾（英语：Acesulfame potassium，又称为乙酰氨基磺酸钾，俗称为安赛蜜）是一种无卡路里的甜味剂。在欧盟，其E编码（添加剂编码）是E950。它是由德国化学家卡尔·克劳斯于1967年在赫希斯特公司（现Nutrinova公司）工作时偶然发现的。从化学结构上说，乙酰磺胺酸钾是6-甲基-1,2,3-氧杂噻嗪-4(3H)酮2,2-二氧的钾盐。它是一个白色结晶粉末，分子式为C₄H₄KNO₄S，分子量为201.24 g/mol。

Acesulfame potassium (ace-SUHL-faym), also known as acesulfame K (K is the symbol for potassium) or Ace K, is a calorie-free sugar substitute (artificial sweetener), and marketed under the trade names Sunett and Sweet One. In the European Union, it is known under the E number (additive code) E950. It was discovered accidentally in 1967 by German chemist Karl Clauss at Hoechst AG (now Nutrinova). In chemical structure, acesulfame potassium is the potassium salt of 6-methyl-1,2,3-oxathiazine-4(3H)-one 2,2-dioxide. It is a white crystalline powder with molecular formula C₄H₄KNO₄S and a molecular weight of 201.24 g/mol.