Decanal diethyl acetal is primarily used in the fragrance and flavor industry due to its pleasant, citrus-like aroma. It serves as a key ingredient in perfumes, colognes, and air fresheners, adding a fresh, aldehydic note to formulations. In food flavoring, it is utilized to enhance citrus and fruity profiles in beverages, confectionery, and baked goods. Its stability under various conditions makes it suitable for use in products requiring a long shelf life. Additionally, it is sometimes employed in organic synthesis as a protective group for aldehydes during chemical reactions.