In the face of current perplexity and debate about the nature of the republican tradition, this chapter recalls and more fully recovers the republican aspects of Cicero’s political philosophy. The creators of the American Republic, especially John Adams, and many others including contemporary scholars, have looked to Cicero as a major figure, if not the founder, of the republican tradition. Analysis of Cicero’s definition of res publica provides the basis for an interpretation that at its core is consent, not necessarily formal and explicit, implying liberty. To be fully human is to be free, and to be free is to be a consenting partner in a political community that is just and at liberty to set its own course. A dynamism toward equality coupled with the necessary wisdom and virtue and their implication of inequality are also essential to Cicero’s republicanism. These essentials are to inform institutions and practices. The practical wisdom in institutions includes the rule of law, indirect rather than direct popular government, and mixed government. Roman (and thus Ciceronian) republicanism can be differentiated in some respects from that very self-conscious and much-heralded form of republicanism that developed in the America of John Adams.