This book is related to biomass energy responds to the official program of the Ministry of Higher Education and Scientific Research in the part of renewable energy in Algeria. It is intended for LMD students in the Science and Technology field of the University of Biskra in the Mechanical Engineering Department. It is an introduction to biomass energy for mechanical engineering students. This document covers the majority of aspects of Biomass Energy. These five chapters are illustrated by series of tutorials that can help the reader better understand the course. The writing of this book was drawn from the existing documentation at the level of all libraries and Internet sites.