Open Access is the electronic resources, which are available freely to the public. Free to read, copy, distribute and use any way you wish. Complies with self-achieving mandates. It means unrestricted online access to peer-reviewed scholarly research. It includes various open access products such as Journals (DOAJ), Repositories (DOAR) and Books (DOAB). This book analyses the availability of the open access books based on the Directory of Open Access Books. Definitely this book will be a valuable literature for the LIS professionals.