The Neurosurgical Society of Australasia (NSA) is a professional not for profit organisation. The NSA was registered under the Corporations Act 2001 in March 2014 as a company limited by guarantee. The Act is administered by the Australian Securities and Investments Commission. Every public company must have documented rules. The rules for the Neurosurgical Society of Australasia are outlined in the Constitution.

Membership to the NSA is voluntary and currently includes approximately 95% of neurosurgeons in Australia and New Zealand. The high membership level reflects the commitment of neurosurgeons to the advancement, maintenance of standards and the delivery of the highest standard of neurosurgical care. Membership confers no rights of privileges for admission to practice as a neurosurgeon.

The objects of the NSA are the study and advancement of the art and science of neurosurgery and research into the cause, prevention and cure of disease in human beings in the field of neurosurgery.