This article argues that Clausewitz’s writing on war nearly 200 years ago is still relevant for contemporary conflict resolution from at least three aspects: his idea that war is “the continuation of policy by other means”; secondly his analysis of the nature of war and the trinity theory; and finally his understanding of the nature of the strategy. The analysis in this article found that, if there is good policy from which to derive a strategy, and if we are able to apply it efficiently, with support of the people and international community, we have created solid preconditions to win the war. In addition, Clausewitz’s view of the issues associated with war, strategy and conflict resolution is important for understanding the major issues and decision making even while history and reality constrain his abstractions with today’s experience. His theories and concepts are as relevant today as they were two hundred years ago. Therefore, the twenty-first century strategists and leaders are recommended to take into consideration Clausewitz’s theories on war and strategy because they are still applicable today. In short, Clausewitz is a theorist for the twenty-first century.