磷酸氢二钾（化学式：K₂HPO₄）又称 磷酸二钾、磷酸一氢钾，是磷酸生成的钾盐酸式盐之一。它为易潮解的白色粉末，可溶于水，水溶液呈弱碱性。

无色四方晶系结晶或白色结晶粉末，有潮解性，可溶于水，微溶于乙醇，低毒性，健康危害等级2，水溶液呈弱碱性。

Dipotassium phosphate (K₂HPO₄) (also dipotassium hydrogen orthophosphate; potassium phosphate dibasic) is a highly water-soluble salt which is often used as a fertilizer, food additive and buffering agent. It is a common source of phosphorus and potassium.