The four articles in this special section identifies and discusses technical challenges and recent results related to Green Computing in Internet of Things. Green Computing is attracting worldwide attention. The emergence of Green Computing will significantly change the way we see the world. All aspects of Information Technology are under investigation, from energy saving design of individual devices, to strategies that consider the entire energy consumption in the design, planning, and management phases, to new paradigms for long term sustainability that includes reformed attitudes of users’ as well as smart energy harvesting techniques. As the advanced information technology at the present stage, Green Computing has received worldwide attention and efforts. Although the concept of Green Computing has been around for some time, its development is still at an exploratory stage.