A number of heterocycles are privilege scaffolds and represents integral part of today's drug regimen. Therefore study of these heterocycles are important for students perspective. In this book, chemistry of oxadizoles and pyrazolines is described in details. Various synthetic methods, experiments and characterization part is also included. Moreover, detail introduction of these heterocycles are provided to give background and application of it. With these contents, this book will be helpful to graduate, postgraduate and research scholars.