In this paper, the authors argue that the cloud computing industry faces many decision problems where operations research could add tremendous value. To this end, they provide an OR perspective on cloud computing in three ways. First, they compare the cloud computing process with the traditional pull supply chain and introduce the Cloud IT Supply Chain as the system of moving information from suppliers to consumers through the cloud network. Second, based on this analogy, they organize the cloud computing decision space by identifying the problems that need to be solved by each player in the supply chain, namely cloud providers, cloud consumers, and cloud brokers.