(3S)-3-Hydroxyoctanoic acid is primarily used in the production of biodegradable polymers, particularly polyhydroxyalkanoates (PHAs). These polymers are valued for their eco-friendly properties and are utilized in packaging materials, medical devices, and agricultural films. Additionally, it serves as a precursor in the synthesis of fine chemicals and pharmaceuticals, where its chiral center is essential for creating specific bioactive compounds. In the cosmetics industry, it is incorporated into formulations for its moisturizing and skin-conditioning properties. Its role in research also extends to studying microbial metabolism and the development of sustainable bioplastics.