Arbitration is a legal technique for the resolution of disputes outside the courts, wherein the parties to a dispute refer it to one or more persons (the "arbitrators", "arbiters" or "arbitral tribunal"), by whose decision (the "award") they agree to be bound. Arbitration in the United States and in other countries often includes alternative dispute resolution (ADR), a category that more commonly refers to mediation (a form of settlement negotiation facilitated by a neutral third party). It is more helpful, however, simply to classify arbitration as a form of binding dispute resolution, equivalent to litigation in the courts, and entirely distinct from the various forms of non-binding dispute resolution, such as negotiation, mediation, or non-binding determinations by experts.

Arbitration is today most commonly used for the resolution of commercial disputes, particularly in the context of international commercial transactions and sometimes used to enforce credit obligations. It is also used in some countries to resolve other types of disputes, such as labour disputes, consumer disputes or family disputes, and for the resolution of certain disputes between states and between investors and states.