A proxy war or proxy warfare is a war that results when opposing powers use third parties as substitutes for fighting each other directly. While powers have sometimes used governments as proxies, violent non-state actors, mercenaries, or other third parties are more often employed. It is hoped that these groups can strike an opponent without leading to full-scale war.

Proxy wars have also been fought alongside full-scale conflicts. It is almost impossible to have a pure proxy war, as the groups fighting for a certain nation usually have their own interests, which can diverge from those of their patron.

Typically proxy wars function best during cold wars, as they become a necessity in conducting armed conflict between at least two belligerents while continuing cold warfare.

A very famous conflict which exhibits patterns of a proxy war was the Spanish Civil War. The conflict that started between the Second Spanish Republic and Francisco Franco's National Sindicalists soon involved Nazi Germany and Fascist Italy on the Spanish Nationalist side and the Soviet Union help on the Spanish Republic's side. This war served as a useful proving ground for both the Axis and the Soviets to test equipment and tactics that would later be employed in the Second World War.

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War is an organized, armed, and often a prolonged conflict that is carried on between states, nations, or other parties typified by extreme aggression, social disruption, and usually high mortality. War should be understood as an actual, intentional and widespread armed conflict between political communities, and therefore is defined as a form of political violence. The set of techniques used by a group to carry out war is known as warfare. An absence of war (and other violence) is usually called peace.

In 2003, Nobel Laureate Richard E. Smalley identified war as the sixth (of ten) biggest problems facing the society of mankind for the next fifty years. In the 1832 treatise On War, Prussian military general and theoretician Carl von Clausewitz defined war as follows: "War is thus an act of force to compel our enemy to do our will."

While some scholars see warfare as an inescapable and integral aspect of human culture, others argue that it is only inevitable under certain socio-cultural or ecological circumstances. Some scholars argue that the practice of war is not linked to any single type of political organization or society. Rather, as discussed by John Keegan in his History of Warfare, war is a universal phenomenon whose form and scope is defined by the society that wages it. Another argument suggests that since there are human societies in which warfare does not exist, humans may not be naturally disposed for warfare, which emerges under particular circumstances. The ever changing technologies and potentials of war extend along a historical continuum. At the one end lies the endemic warfare of the Paleolithic^{[citation needed]} with its stones and clubs, and the naturally limited loss of life associated with the use of such weapons. Found at the other end of this continuum is nuclear warfare, along with the recently developed possible outcome of its use, namely the potential risk of the complete extinction of the human species.