“English-Thai Dictionary of Thai Traditional Medicine” is created to help promote the understanding of the knowledge of Thai traditional medicine (TTM), Thai medicinal plants and Thai traditional medicine preparations and can be used as another reference of TTM for Thais and foreigners. The dictionary can assist in further searching for more information on TTM and Thai medicinal plants from Thai or English sources or websites. For local manufacturers of traditional medicinal products, the information provided will be useful for the preparation of documents for product registration and licensing.