(9Z,12Z)-Octadeca-9,12-dienal is primarily used in the fragrance and flavor industry due to its characteristic odor profile. It is often incorporated into perfumes and cosmetic products to impart a fresh, green, and slightly fatty scent, reminiscent of cut grass or leaves. In food flavoring, it is used to enhance the taste of certain products by adding a subtle, natural aroma. Additionally, it serves as an intermediate in the synthesis of other complex organic compounds, particularly in the production of specialty chemicals for research and industrial applications. Its role in mimicking natural scents makes it valuable in creating eco-friendly and sustainable fragrance formulations.