This book highlights the utilization of biomaterials as emerging suitable and effective flame retardants (FRs) to replace most of the conventional FRs (e.g., halogenated FRs). Biomaterials are considered to be sustainable, biodegradable, and renewable resources. They are abundantly available, which makes them affordable. Information and findings on the characteristics of biomaterials and their use as FRs have been explored. Herein, the tremendous scientific progress made in using biomaterials as flame retardants for a wide range of products is elucidated. The major goal is to draw attention to the opportunities and challenges of switching to biomaterial-based FRs in place of conventional FRs in order to create a sustainable society.