  Should political leaders violate the deepest constraints of morality in order to achieve great goods or avoid disasters for their communities? This question poses what has become known amongst philosophers as the problem of dirty hands. There are many different strands to the philosophical debate about this topic, and they echo many of the complexities in more popular thinking about politics and morality. All, however, involve the idea that correct political action must sometimes conflict with profound moral norms. This entry seeks to unravel these strands and clarify the central normative issues about politics that the cry of ‘dirty hands’ evokes. Beginning with an illustrative passage from a renowned 19th century English novel, the essay traces the dirty hands tradition back to Machiavelli, though its present vogue is owed mostly to the writings of the distinguished American political theorist, Michael Walzer. Walzer’s views are explored in the light of earlier theorists such as Machiavelli and Max Weber and certain vacillations in his intellectual posture are briefly discussed. This leads to the posing of five issues with which the entry is principally concerned. First, is the dirty hands problem simply confused and its formulation the merest contradiction? Second, does the overriding of moral constraints take place within morality or somehow beyond it? Third, can the cry of dirty hands be restricted wholly or principally to politics or does it speak equally to other areas of life, and, where politics is concerned, do only the principal agents get dirty hands or do their citizens share in the taint? This is the problem of scope. Fourth, how are the circumstances that call for dirty hands best described? Fifth, the dirty hands problem has affinities with the problem raised by moral dilemmas, but the question is: should those similarities be allowed to obscure significant differences?