硫酸钾（化学式K₂SO₄）是硫酸根离子与钾离子结合生成的化合物。其固体为无色或白色六方形或斜方晶系结晶或颗粒状粉末。溶于水，不溶于醇、丙酮和二硫化碳。具有苦咸味。

硫酸钾在农业上是常用的钾肥，含钾量约为50%，在**俗称为"白加里"。此外，硫酸钾在工业上还用于玻璃，染料，香料，医药等。

Potassium sulfate (K₂SO₄) (in British English potassium sulphate, also called sulphate of potash, arcanite, or archaically known as potash of sulfur) is a non-flammable white crystalline salt which is soluble in water. The chemical compound is commonly used in fertilizers, providing both potassium and sulfur.