This book comprises of 13 chapters focusing on issues and development of antibacterial agents. The content is divided into two main segments, focusing on issues and types of antibacterial agents. The types of antibacterial agents discussed in this book can be divided into three main groups which are (1) organic including essential oils, natural products and nanofiber, (2) inorganic including biosynthesized silver nanoparticles, metal-loaded zeolites and kaolinites, carbon nanotubes and titania, and (3) hybrid organic-inorganic including organo-modified metal-loaded zeolite and metal-organic-framework. Chapters in this book present research and reviews on development of these antibacterial agents in terms of their fundamental principles, characteristics, antibacterial assays and mechanisms. This book provides guidelines to researchers, scientists or professionals from industries who are involved in developing new antibacterial agents.