The Graduate Diploma in Science (Advanced) is a postgraduate qualification in the Natural and Physical Sciences that provides science graduates with the opportunity to extend and deepen their discipline knowledge to an advanced level, often incorporating a significant research component alongside high-level coursework. Designed as a one-year full-time (or longer part-time) program, it allows graduates who already hold an undergraduate science degree to sharpen their expertise within a chosen stream — such as BioSciences, Chemistry, Earth Sciences, Mathematics and Statistics, or Physics — while also developing critical thinking, analytical, and research skills that are directly applicable to professional and academic environments. The course typically comprises both advanced coursework subjects and a supervised research project, with institutions allowing students to tailor the balance between these components based on their background and career goals.

The Graduate Diploma in Science (Advanced) is tailored for science graduates seeking to upgrade their qualifications, pivot into a new scientific discipline, or build the foundational research skills needed to progress to a Master's or PhD program. Typical employers of graduates span a wide range of sectors, including universities and research institutions, government scientific agencies (such as CSIRO, the Bureau of Meteorology, Geoscience Australia, and state environment departments), pharmaceutical and biotech companies, mining and resources companies, environmental consultancies, defence and national security bodies, and technology and data analytics firms. The qualification is also a recognised pathway for professionals already working in science-related industries who want to formalise or expand their expertise.

To be admitted to the Graduate Diploma in Science (Advanced) in Australia, applicants are typically required to hold a completed undergraduate bachelor's degree (or equivalent) in an appropriate science discipline relevant to their chosen stream. Most institutions require a minimum weighted average mark (WAM) of at least 65% (equivalent to a Credit or H3 level) in relevant discipline subjects at second year or above, though some providers may accept applicants with lower academic achievement if they can demonstrate substantial relevant professional experience in a science-related field. Appropriate prerequisite study varies by stream — for example, BioSciences streams typically require prior study in biological sciences, Chemistry streams require prior university chemistry, Mathematics and Statistics streams require prior study in calculus and linear algebra, and Earth Sciences streams may accept backgrounds in geology, geography, environmental science, or physics.

For international applicants, all Australian universities require evidence of English language proficiency. Accepted tests typically include IELTS Academic (commonly a minimum overall score of 6.5–7.0, with no individual band below 6.0), TOEFL Internet-based Test, Pearson Test of English Academic, Cambridge English Advanced (CAE), and similar approved tests. Some institutions may also accept evidence of prior tertiary study conducted entirely in English in lieu of a formal language test. Applicants who do not fully meet academic prerequisites but who hold extensive practical experience in a relevant science or science-related profession may, at the discretion of the institution, be admitted subject to completing additional bridging coursework. Prospective students should note that entry requirements — including specific prerequisite subjects — vary between institutions and across streams, and it is strongly advisable to consult the relevant institution's admissions office for detailed, stream-specific guidance.