This book provides a detailed overview of mosquitoes. It covers aspects of their origin, evolution, morphology, diversity, biology, and host finding and recognition. It also describes the behavior and rhythmicity of mosquitoes, their abiotic and biotic interactions, disease vectors and mechanism of disease transmission. Chapters describe mosquito-borne human diseases, mosquito-borne veterinary diseases, and management of mosquitoes. This book provides the readers with both the positive as well as the negative aspects of mosquitoes. It also discusses their use in research as a model organism and development of micro needles and their role in crop pollination. This book is useful for the students studying entomology, public health, medical and veterinary sciences, and applied life sciences. It is also a reference for those working in policy planning and vector management.