The Bachelor of Marine Science is an interdisciplinary undergraduate degree that combines the biological, physical, and chemical sciences to develop graduates with specialised knowledge of marine life and coastal environments. The course covers the full breadth of the marine science discipline, integrating subjects such as marine biology, oceanography, marine ecology, marine chemistry, geology, and environmental management. Students explore marine systems from the open ocean to estuaries and coral reefs, examining how biological and physical processes interact at all levels of biological organisation. The degree is closely aligned with Australia's National Marine Science Plan and is designed for students who are passionate about understanding, managing, and protecting ocean and coastal environments. Typically delivered over three years full-time, the course combines rigorous academic study with extensive fieldwork, laboratory science, and opportunities to work alongside leading research institutions. Australian universities offering this degree are often located in coastal regions, giving students direct access to some of the world's most diverse and significant marine ecosystems, including the Great Barrier Reef, the Southern Ocean, and the Ningaloo Coast. Key employers of graduates include the Australian Institute of Marine Science (AIMS), CSIRO, Geoscience Australia, state fisheries agencies, environmental consulting firms, the oil and gas industry, marine parks authorities, local and state government environmental departments, conservation non-profits, and university research centres.

For domestic students, entry into a Bachelor of Marine Science typically requires completion of Year 12 (or equivalent) with an ATAR generally ranging from 65 to 85, depending on the institution and program competitiveness. Prerequisite subjects commonly required or recommended include Biology and/or Chemistry at a senior secondary level, and Mathematics is often strongly recommended or compulsory. Some programs may allow students without ATAR mathematics to complete bridging mathematics units during their first year of study, and similarly, students without senior Chemistry may be required to complete a preparatory chemistry unit. Alternative entry pathways are available for mature-age applicants, those with a completed Diploma or Certificate IV qualification, and students who have partially completed another undergraduate degree. Many institutions also offer foundation or preparation programs (such as a university preparation certificate) that provide a pathway into the degree for those who do not meet standard admission requirements. International students are required to demonstrate English language proficiency, with a minimum IELTS overall score of 6.5 (with no individual band below 6.0) being a common benchmark, though specific requirements vary by institution. Some providers also accept alternative English tests such as TOEFL, PTE Academic, and Cambridge English. High-achieving students may be eligible for an Honours year or combined Bachelor's/Master's programs, which typically require a higher ATAR (around 90+) and strong academic performance throughout their undergraduate studies.