法的渊源，简称法源，基本含义是法的来源或法的栖身之所，亦称法律的形式，指法律的存在或表现形式。法的渊源一词法源于欧洲大陆古罗马的Fontes iuris，普遍使用法的渊源一词的是英美法系的学者。法的渊源是法理学中的重要概念。

在传统法的渊源理论中，认为法的渊源可以指：实质渊源，法源于自然理性还是君主意志；效力渊源，法产生于立法机关还是其他机关；材料渊源，法的制定是源于习惯还是外国引进；形式渊源，法来自制定还是习惯以及历史渊源，引起法产生的历史事件等。

Sources of law means the origins of law, i.e. the binding rules governing human conduct. Such sources may be international, national, regional or religious.

The term "sources of law" also refers to the sovereign or the state from which the law derives its force or validity. In civil law systems, one has only to look at the appropriate code; but in common law systems one needs to look at legislation (primary and secondary) and at the decided cases that comprise judicial precedent.