Potassium sorbate, also known as preservative 202, is a chemical additive that is widely used as a preservative in foods, drinks, and personal care products. It is the potassium salt of sorbic acid and is effective in inhibiting the growth of mold, yeast, and fungi, thereby prolonging the shelf life of products. Potassium sorbate is considered a food-grade preservative that is generally recognized as safe (GRAS) . It is used in a variety of applications, including food, wine, personal care products, and dietary supplements. Potassium sorbate is also used in moist cat and dog foods and in other animal feed.

Potassium sorbate is produced synthetically, although it occurs naturally in rowan and hippophae berries. It is used in concentrations of 0.025-0.100% as a food additive, which in a 100 g serving yields an intake of 25-100 mg. In the United States, no more than 0.1% is allowed in fruit butters, jellies, preserves, and related products. Potassium sorbate is also used in many personal care products to inhibit the development of microorganisms for shelf stability.

On ingredient statements, potassium sorbate is labeled as "potassium sorbate" or "E202". There is some question regarding whether or not potassium sorbate is vegan, but as a naturally occurring preservative, it is generally considered vegan. Potassium sorbate is gluten-free and vegan. When used appropriately, the U.S. Food and Drug Administration (FDA) recognizes potassium sorbate as being generally safe.