Just and Unjust Wars: A Moral Argument with Historical Illustrations is a 1977 book by the philosopher Michael Walzer.

The book resulted from Walzer's reflections on the Vietnam War.

Just and Unjust Wars has, together with Spheres of Justice (1983) and Interpretation and Social Criticism (1987), been identified as one of Walzer's most important works by the philosopher Will Kymlicka in The Oxford Companion to Philosophy (2005).

[2] The work is considered a standard in the philosophical literature on the ethics of warfare, with the Stanford Encyclopedia of Philosophy calling Just and Unjust Wars "extraordinarily influential" and "the major contemporary statement of just war theory.

"[3] The book has been translated to French by Simone Chambon and Anne Wicke and published in the collection of Claude Lefort in Belin.