Phenyl nonanoate is primarily used in the fragrance industry as a key ingredient in perfumes and scented products. It imparts a floral, rosy, and slightly fruity aroma, making it a popular choice for creating complex and appealing scent profiles. Additionally, it is utilized in the formulation of air fresheners, candles, and personal care items like lotions and soaps to enhance their olfactory appeal. Its stability and long-lasting fragrance make it a valuable component in both fine and commercial fragrances.