This encyclopaedia titled "International Encyclopaedia of Chemical and Biological Weapons & Warfares" is designed to serve the purpose of a complete reference book on the subject area of chemical and biological weapons, warfares and laws. This encyclopaedia provides readers with a comprehensive listing related legislations at international regional and national levels. It is for this reason, the whole encyclopaedia is divided into two parts. This encyclopaedia successfully presents the various legal options we have today to tackle this serious problem which question the very existence of human beings in some way or the other. An introduction to chemical and biological weapons is provided. An overview of chemical weapons related global measures are explained. A detailed report on chemical warfare, chemical agents and substances is provided. An overview of Chemical Weapon Convention is also given. Roles of biological agents and systems mass production of biological weapons and their use have been described. An overview of global rules and measures with respect to Biological Weapons Convention is presented. Bioterrorism and its counter measures are discussed. Infectious disease, leakages / bombs are explained through select case studies. This encyclopedia has an extensive appendix giving readers proper acquaintance with related documents, database and fact-sheets. An bibliography and glossary of terms is given in an alphabetical order, so that readers can make use of them for further research and investigation. A website / link resource material is also provided herein to make this reference book more research friendly, as is the case with an extensive indexing done herein. In sum, this encyclopaedia is a unique initiative to help provide the most comprehensive coverage to the subject area in question. It accounts for an integrative approach and user-friendly methodology. The editors believe that this encyclopedia will prove itself a milestone in times to come for addressing the issue of chemical and biological weapons, warfares and laws.