过一硫酸氢钾复合盐（Potassium peroxymonosulfate），有时也称“过一硫酸氢钾”，化学式为2KHSO₅·KHSO₄·K₂SO₄。

它是过一硫酸氢钾、硫酸氢钾和硫酸钾组成的复盐，商品名为Caroat或Oxone，常用作有机合成中的氧化剂。

过一硫酸氢根离子与硫酸氢根离子的半反应的标准电极电势值为-1.44V：

用过一硫酸氢钾复合盐可将吖啶氧化为吖啶-N-氧化物：

氧化硫醚时的中间产物亚砜较不易被转化为砜，因此与硫醚以1:1计量反应得到亚砜，以2:1计量得到砜：

Potassium peroxymonosulfate (also known as MPS, potassium monopersulfate, and the trade names Caroat and Oxone) is widely used as an oxidizing agent. It is the potassium salt of peroxymonosulfuric acid.

The potassium salt is marketed by four companies: Arch Pool Chemicals(a subsidiary of Lonza Pharma Group), Evonik (formerly Degussa) under the trade name Caroat, DuPont under the trade name Oxone, and Hangzhou Focus Chemical Co., Ltd. It is a component of a triple salt with the formula 2KHSO₅·KHSO₄·K₂SO₄. The standard electrode potential for this compound is +2.51 V with a half reaction generating the hydrogen sulfate (pH=0).