山梨酸钾（化学式：C₆H₇O₂K），又名2,4-己二烯酸钾，是山梨酸的钾盐。

无色或白色至浅黄色鳞片状结晶、结晶状粉末或颗粒。无臭或稍有臭味。在空气中不稳定，长时间放置时吸湿并氧化分解而着色。常温下密封保存不会分解。易溶于水。基本无毒。

Potassium sorbate is the potassium salt of sorbic acid, chemical formula CH₃CH=CH-CH=CH-CO₂K. It is a white salt that is very soluble in water (58.2% at 20 °C). It is primarily used as a food preservative (E number 202). Potassium sorbate is effective in a variety of applications including food, wine, and personal care products. While sorbic acid is naturally occurring in some berries, virtually all of the world's production of sorbic acid, from which potassium sorbate is derived, is manufactured synthetically.