Bagmati is a holy river of Nepal. It is originated from Bagdwar. Kathmandu metropolitan, Nepal's capital is situated on the bank of river Bagmati. Hindus religious peoples also take bath in this river before they worship their gods. Thus this river has much more importance to us. Still no more biodiversity of this river is studied. Since biodiversity is an important factor of our ecosystem. In this book, a detail biodiversity of river Bagmati is provided which may be useful to concerned ones.