United Nations can be identified as a very important International Organization standing in the forefront, among others. The main objective of this study is to verify the manner through which it played its own role, to safeguard World peace and Security. First, we will inquire about the nature of the strategies employed by the UNO to achieve such targets. At this point, secondary sources of information were collected and explanatory research method was used in place of the learning methodology. The conclusion and the outcome of their involvement show, even there were certain setbacks, the UNO has played a major role in maintaining world peace and security.