It is natural to wonder about contract law’s relationship to the morality of promises and agreements. This Chapter distinguishes two ways to conceive of that relationship. First, parties’ agreement-based moral obligations might figure into the explanation of contract law—into an account of its functions or justifications. Contract law might serve to enforce parties’ first-order performance obligations, to enforce second-order remedial obligations, to support the culture of making and keeping agreements more generally, or at least to do no harm to that culture or to people’s ability to act morally. Second, contract can be understood as the legal analog to promise. Both contract and promise enable people to undertake new obligations to one an...