ó-Decalactone is a lactone and aroma compound with the chemical formula C<sub>10</sub>H<sub>18</sub>O<sub>2</sub>. It has an intense peach flavour, naturally present in many fruits and fermentations. It is particularly important in the formulation of peach, apricot, and strawberry flavourants for drinks, food, personal care products, pharmaceutical drugs, and household goods.