欧盟法律是与欧盟各成员国国内法律平行执行的独立法律系统。欧盟法律在欧盟各成员国的法律系统有直接效力，在很多领域高于国内法，特别是单一市场所涵盖的领域(经济政策和社会政策方面)。根据欧洲法院的确认，欧盟不是一个联邦政府而是构成国际法中一个全新法律秩序的联合体。欧盟法律有时候被归类为超国家法，目前在27个成员国中大约有5亿欧盟公民受欧盟法律支配，这使其称为世界上适用最广泛的现代法律系统之一。

就像欧盟本身一样，欧盟法律也可以分为三大支柱。第一支柱是欧共体支柱，涵盖欧盟制定的大部分法律，欧洲法院具有最高权威。欧盟同时还根据第二支柱-对外政策和第三大支柱-刑法制定法律，此时欧洲法院的权威被削减并不适用直接效力。

European Union law is a body of treaties and legislation, such as Regulations and Directives, which have direct effect or indirect effect on the laws of European Union member states. The three sources of European Union law are primary law, secondary law and supplementary law. The main sources of primary law are the Treaties establishing the European Union. Secondary sources include regulations and directives which are based on the Treaties. The legislature of the European Union is principally composed of the European Parliament and the Council of the European Union, which under the Treaties may establish secondary law to pursue the objective set out in the Treaties.