The Australian legal system: an overview 

Australian law is best understood as a system of institutions, sources and relationships rather than a single code. Students usually begin by learning who can make law, how legal rules are recorded, and which institutions resolve disputes about meaning and validity.

Why Australian law is plural rather than unitary

Australia is a federation. The Commonwealth and each state have their own legislatures, executives and courts, and the territories also operate under their own legislative arrangements. That means a legal question may require students to ask several separate questions at once:

1. Which parliament or law-maker had power to create the rule?
2. What kind of legal source records the rule?
3. Which court or tribunal can decide a dispute about it?
4. Does another law displace, limit or supplement the rule?

The starting constitutional structure appears in the Commonwealth of Australia Constitution Act 1900 (Imp) and in the practical operation of Commonwealth and state institutions. Covering clause 5 is what holds the parts together: the Constitution and the laws made under it bind the courts, judges and people of every State.¹

Main sources of Australian law

Australian students usually work with three recurring source types:

• legislation, meaning Acts passed by a parliament;
• delegated legislation, meaning regulations, rules or other instruments made under statutory authority; and
• case law, especially decisions of appellate courts that shape the doctrine of precedent.

A proposition about Australian law is stronger when the student can identify which of those source types supports it and why that source is authoritative.

Institutions and functions

Australian public law often begins with the familiar distinction between legislative, executive and judicial functions. The distinction is not absolute in every practical detail, but it remains a useful organising idea.

• Parliaments enact statutes.
• Executives administer statutes and often make delegated legislation under statutory authority.
• Courts interpret legislation, decide disputes and develop the common law within recognised limits.

For many beginning law students, the hardest step is recognising that these institutions interact. A statute may delegate rule-making power to the executive, and a court may later decide whether the delegated instrument was validly made.

The importance of jurisdiction

A legal rule does not automatically apply everywhere in the same way. Some rules are Commonwealth-wide. Others belong to a state or territory. Many foundational topics therefore need to be studied through both a national lens and a jurisdiction-specific lens. A rule that is settled nationally and a rule that varies by jurisdiction call for different reading, and the second always requires naming the jurisdiction before stating the rule.

How this matters for first-year study

Students do not need to master every doctrinal field before learning legal method. But they do need a stable map of the system. The articles on sources and authority basics, court hierarchy and jurisdiction, and constitutional foundations and federalism deepen that map.

Source anchors

• Federal Register of Legislation for Commonwealth statutes and instruments.
• High Court of Australia judgments for current High Court decisions.
• The official legislation portal of each state and territory, for that jurisdiction's own statutes.