The book entitled Hybrid Polyaniline Nanocomposite for Humidity Sensing contains five chapters based on the conducting polymer nanocomposites for humidity sensing application. The chapters includes Introduction to Nanocomposite, Synthesis of nanocomposite, Characterization techniques, Humidity tests and finally summary of the work. Each chapter has got its own importance in the field of sensor technology, this book will keep the interest of the scientists, academicians update about new approach of wet Chemistry and Nanocomposite. The main motto of my book is to enhance the knowledge of science for the next generation of the contemporary world.