As we all know the Working of Blood Bank Management System. A blood bank is a cache or bank of blood or blood components, gathered as a result of blood donation or collection, stored and preserved for later use in blood transfusion. The main aim of this project is to save lives of people by providing blood online using technology. Our project Online Blood Bank system using Cloud Computing is developed so that users can view the information of nearby donors, hospitals, blood banks. This project is developed by three perspectives i.e. hospital, blood bank, and patient/donor. We have provided security for authenticated user as a new user have to register according to their type of perspective and existing user have to log in. While registering, to check whether the donor is giving correct information about his blood group we will ask the donor to upload his/ her license or any government id proof on which blood group is mentioned. This project requires an internet connection. We are using the android application to find a nearby donor and to select the nearby hospital online instantly by tracing its location using GPS. We are also proving an alert system for severe accidents as using that function an ambulance will be sent to your destination without any wastage of time. Notification regarding blood donation camps, health check-up drives etc. in the area will also be sent to the registered users. This application reduces the time to a greater extent that is searching for the required blood through blood banks and hospitals. Thus this application provides the required information in less time and also helps in quicker decision making. It basically bridges the gap between donor and the receiver. It provides better blood management and storage.