The Judiciary Act 1903 (Cth) is an Act of the Parliament of Australia that regulates the structure of the Australian judicial system and confers jurisdiction on Australian federal courts.

[1] It is one of the oldest pieces of Australian federal legislation[1] and has been amended over 70 times.

[5] Section 78B of the Act requires Australian courts to ensure that the parties have given notice to the attorneys-general of Australia and of each state before proceeding with any case involving a "matter arising under the Constitution."

Section 78 and 79 of the Act govern the application of state law by Australian federal courts.

The two sections borrow verbiage from the American Rules of Decision Act.