Cloud computing has developed as best way of sharing and providing resources over the internet. The capability to deliver guaranteed Quality of Service is vital for commercial success of cloud platforms. The process of entering into the cloud is usually in the form of queue, so each user need to wait until the current user is being served. In this paper, we have discussed about several queueing model for cloud computing. These models are used to reduce waiting time of customer(calls) and increase performance of the system. Furthermore, we have presented comparison of several queueing models results which are used for cloud computing environment. © 2016, International Journal of Pharmacy and Technology. All rights reserved.