By definition, diplomacy aims to solve conflicts and disputes that nations experience between eachother with the ways of negotiation or mediation and also aims to prevent violence between states. Atthe same time, diplomacy opens the way for the sides to profit without giving any loss. It is possible tocome to the following approach through these definitions and functions about diplomacy; diplomacy isalso a means of peace-making. It is even one of the biggest goals of this diplomacy. On the other hand,it is not possible to say that this goal is 100% successful in practice. It is seen that diplomacy issometimes inadequate about peace-making in most cases that took place in world political history. Inthis context, the Cyprus issue has passed into the history of the world as a very long and laboriousprocess of diplomacy. In most negotiations in Cyprus issue, peace-making which is the main aim ofdiplomacy, has been inadequate. In this study, the success of the diplomacy on making peace andpersuading the parties will be evaluated on the Cyprus issue.