The textbook "Intestinal Microorganisms of Termites and Other Invertebrates" offers a comprehensive examination of the microbes living in the digestive systems of soil invertebrates. It highlights the crucial role these microorganisms play in the decomposition and recycling of organic materials, emphasizing the importance of the gut microbiota of termites, which are considered the most studied invertebrates. The book begins with a detailed overview of the biology of soil invertebrates and then delves into the specific microbes found in the digestive tracts of termites and other key decomposers such as earthworms, springtails, millipedes, and woodlice. Additionally, innovative techniques for studying these intestinal microbes are presented, making the book a valuable resource for researchers and students in the fields of microbiology and soil science.