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Water conflict is a term describing a conflict between countries, states, or groups over an access to water resources. The United Nations recognizes that water disputes result from opposing interests of water users, public or private. A wide range of water conflicts appear throughout history, though rarely are traditional wars waged over water alone. Instead, water has historically been a source of tension and a factor in conflicts that start for other reasons. However, water conflicts arise for several reasons, including territorial disputes, a fight for resources, and strategic advantage. A comprehensive online database of water-related conflicts—the Water Conflict Chronology—has been developed by the Pacific Institute. This database lists violence over water going back nearly 6,000 years. 

These conflicts occur over both freshwater and saltwater, and both between and within nations. However, conflicts occur mostly over freshwater; because freshwater resources are necessary, yet scarce, they are the center of water disputes arising out of need for potable water, irrigation and energy generation. As freshwater is a vital, yet unevenly distributed natural resource, its availability often impacts the living and economic conditions of a country or region. The lack of cost-effective water supply options in areas like the Middle East, among other elements of water crises can put severe pressures on all water users, whether corporate, government, or individual, leading to tension, and possibly aggression. Recent humanitarian catastrophes, such as the Rwandan genocide or the war in Sudanese Darfur, have been linked back to water conflicts.

A recent report "Water Cooperation for a Secure World" published by Strategic Foresight Group concludes that active water cooperation between countries reduces the risk of war. This conclusion is reached after examining trans-boundary water relations in over 200 shared river basins in 148 countries, though as noted below, a growing number of water conflicts are sub-national.

Causes