The book "Lesser Known Large dsDNA Viruses" offers a comprehensive analysis of lesser-known large dsDNA viruses that are significant in the scientific community. While viruses such as smallpox and herpesviruses are widely recognized due to their impact on human health, this work also highlights other important virus families that are often overlooked. Among these are the giant mimiviruses, which boast a size of 1.2 Mb. These viruses play a crucial role in various ecological and biological processes. The book provides a detailed overview of seven virus families and their relevance in nature and biotechnology. It is aimed at professionals and students who wish to develop a deeper understanding of the diversity and significance of these viruses.