Indonesia has an abundant source of biodiversity including plants that contain essential oils. Since ancient times until now, Indonesia is known worldwide as a source of essential oils, even some of these essential oils are export commodities that contribute foreign exchange to the country. Essential oils are one of the raw materials for making medicines, perfumes, cosmetics, food, aromatherapy, vegetable pesticides, and so on. Materia Kosmetika Indonesia Natural Materials Essential Oil Series is a guidebook that contains monographs of essential oils produced in Indonesia that are used as raw materials for cosmetics. The monograph contains information including the identity of essential oils, information on producing plants, plant descriptions, cultivation methods, harvesting and post-harvest processing, manufacturing processes, oil specifications, chemical content, chemical structure, and safety data.