Administrative law is a division of law governing the activities of executive branch agencies of government. Administrative law includes executive branch rulemaking (executive branch rules are generally referred to as "regulations"), adjudication, and the enforcement of laws. Administrative law is considered a branch of public law.

Administrative law deals with the decision-making of administrative units of government that are part of the executive branch in such areas as international trade, manufacturing, the environment, taxation, broadcasting, immigration, and transport.

Administrative law expanded greatly during the 20th century, as legislative bodies worldwide created more government agencies to regulate the social, economic and political spheres of human interaction.

Civil law countries often have specialized administrative courts that review these decisions.

In the last fifty years, administrative law, in many countries of the civil law tradition, has opened itself to the influence of rules posed by supranational legal orders, in which judicial principles have strong importance: it has led, for one, to changes in some traditional concepts of the administrative law model, as has happened with the public procurements or with judicial control of administrative activity and, for another, has built a supranational or international public administration, as in the environmental sector or with reference to education, for which, within the United Nations' system, it has been possible to assist to a further increase of administrative structure devoted to coordinate the States' activity in that sector.

Unlike most common law jurisdictions, most civil law jurisdictions have specialized courts or sections to deal with administrative cases that as a rule apply procedural rules that are specifically designed for such cases and distinct from those applied in private law proceedings, such as contract or tort claims.

In Brazil, administrative cases are typically heard either by the Federal Courts (in matters concerning the Federal Union) or by the Public Treasury divisions of State Courts (in matters concerning the States). In 1998 a constitutional reform led by the government of President Fernando Henrique Cardoso introduced regulatory agencies as a part of the executive branch. Since 1988, Brazilian administrative law has been strongly influenced by the judicial interpretations of the constitutional principles of public administration (Art. 37 of the Federal Constitution): legality, impersonality, publicity of administrative acts, morality and efficiency.

In Chile, the President of the Republic exercises the administrative function, in collaboration with several ministries or other authorities with ministerial rank. Each ministry has one or more under-secretaries that act through public service to meet public needs. There is no single specialized court to deal with actions against the administrative entities, but there are several specialized courts and procedures of review.