铬酸钾（化学式：K₂CrO₄）是黄色固体，是铬酸所成的钾盐。铬酸钾中铬为六价，属于二级致癌物质，吸入或吞食会导致癌症。

铬酸钾可由重铬酸钾和碳酸钾反应得到：

K₂Cr₂O₇ + K₂CO₃ → 2K₂CrO₄ + CO₂↑

或者将氢氧化钾溶液加入至三氧化铬至反应液为黄色时为止，可得到铬酸钾。

Potassium chromate is the inorganic compound with the formula (K₂CrO₄). This yellow solid is the potassium salt of the chromate anion. It is a common laboratory chemical, whereas sodium chromate is important industrially. It is a class two carcinogen.