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In law, custom can be described as the established patterns of behavior that can be objectively verified within a particular social setting. A claim can be carried out in defense of "what has always been done and accepted by law." Generally, customary law exists where:

• a certain legal practice is observed
• the relevant actors consider it to be law (opinio iuris).

The modern codification of civil law developed out of the customs, or coutumes of the Middle Ages, expressions of law that developed in particular communities and slowly collected and written down by local jurists. Such customs acquired the force of law when they became the undisputed rule by which certain entitlements (rights) or obligations were regulated between members of a community..

In international law, customary law refers to the Law of Nations or the legal norms that have developed through the customary exchanges between states over time, whether based on diplomacy or aggression. Essentially, legal obligations are believed to arise between states to carry out their affairs consistently with past accepted conduct. These customs can also change based on the acceptance or rejection by states of particular acts. Some principles of customary law have achieved the force of peremptory norms, which cannot be violated or altered except by a norm of comparable strength. These norms are said to gain their strength from universal acceptance, such as the prohibitions against genocide and slavery. Customary international law can be distinguished from treaty law, which consists of explicit agreements between nations to assume obligations. However, many treaties are attempts to codify pre-existing customary law.

Customary law may also be relevant within jurisdictions following another legal tradition such as civil law in fields or subfields of law where no legislative enactment exists. For example, in Austria, scholars of private law often claim that customary law continues to exist, whereas public law scholars dispute this claim. In any case, it is hard to find any practically relevant examples. In the Scandinavian countries customary law continues to exist and has great influence. Customary law is also used in some Third World countries, such as in Africa, usually used alongside common or civil law.[1]

Custom is used in tort law to help determine negligence. Following or disregarding a custom is not determinative of negligence, but instead is an indication of possible best practices or alternatives to a particular action.

• Legal systems of the world
• Consuetudinary
• Common law
• Customary international law

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