- N. J. Huckson and Co (? - 1929)
- Nabalco Pty Ltd (1964 - )
- National Acoustic Laboratories (1974 - 1992), Commonwealth of Australia
- National Ageing Research Institute Incorporated (1994 - )
- National Association of Testing Authorities (1947 - )
- National Bag Company of Australia Ltd ( - 1971)
- National Cattle Breeding Centre (1952 - )
- National Centre for Theoretical Physics (1994 - 1999), Australian National University
- National Climate Centre (1985 - ), Commonwealth Bureau of Meteorology
- National Committee for the History and Philosophy of Science (1969? - ), Australian Academy of Science
- National Energy Advisory Council (NEAC) (1977 - )
- National Energy Research, Development and Demonstration Council (NERDDC) (1978 - )
- The National Florence Nightingale Committee of Australia (1955 - 1993)
- The National Florence Nightingale Memorial Committee of Australia (1946 - 1955)
- National Gallery of Victoria (1870 - )
- National Health and Medical Research Council (NHMRC) (1936 - ), Commonwealth of Australia
- National Health and Medical Research Council (NHMRC), Poisons Schedule Standing Committee
- National Herbarium of Victoria (1853 - )
- National Meteorological Analysis Centre
- National Meteorological Centre (1985 - 1990s)
- National Museum of Australia (1980 - )
- National Paints Pty Ltd (? - 1977)
- National Research Institute of Gerontology and Geriatric Medicine (1975 - 1994)
- National Safety Council of Australia (c. 1931 - )
- National School of Design, Swinburne University of Technology
- National Scientific Instrumentation Training Centre ( - c. 2000), Swinburne University of Technology
- National Sirex Fund (1960s - )
- National Standards Commission (1950 - )
- Natural Heritage Division (2000 - ), Commonwealth of Australia
- Natural Resources Conservation League of Victoria (1951 - )
- Nature Conservation Society of South Australia (1963 - )
- NEC Australia (1969 - )
- Nestlé Australia Ltd (1908 - )
- Neurophysiological Sciences Society of Australia
- Neurosurgical Society of Australasia (1940 - )
- New England University College (1938 - 1954), The University of Sydney
- The New South Wales College of Nursing ( - 2002)
- New South Wales Department of Agriculture (1908 - ), State of New South Wales
- New South Wales Department of Agriculture (1974 - 1975), State of New South Wales
- New South Wales Department of Railways (1932 - ), State of New South Wales
- New South Wales Forest Conservancy Branch (1882 - 1900s), State of New South Wales
- New South Wales Government Tramways, State of New South Wales
- New South Wales Public Works Department (1941 - 1980s), State of New South Wales
- New South Wales State Dockyard
- New South Wales State Rail Authority (1980 - 2003), State of New South Wales
- New South Wales University of Technology (1949 - 1958)
- New Zealand Society of Immunology (1975 - 1992)
- Newcastle Chemicals (1940 - )
- Newcastle Coal and Copper Mining Co (c. 1850 - )
- Newport Power House
- News Limited (1922 - )
- Nicholas Australia Ltd (1968 - 1970)
- Nicholas International Ltd (1970 - 1981)
- Nicholas Kiwi Limited (1981 - 1984)
- Nicholas Pty Ltd (1921 - c. 1984)
- Nobel (Australasia) Ltd (1898? - 1926)
- Nobel Industries Ltd
- Nobel's Explosives Company Ltd
- Noel P. Hunt Ltd (1921 - c. 1980)
- Norcoast Refrigeration Company (1980s - )
- North Broken Hill Ltd (1895 - 1976)
- North Queensland Engineers and Agents Pty Ltd (1948 - c. 1990)
- North Queensland Meat Export Company
- Northern District School of Nursing, Graduates' Association (1972 - )
- Northern Territory Electricity Commission (1978 - )
- Northern Territory University (1989 - 2004)
- Northern Woodchips Pty Ltd (1970s - )
- Novo Industries A/S (1925 - 1989)
- NSW Agriculture - see New South Wales Department of Agriculture (1908 - ), State of New South Wales
- Nuclear Research Foundation (1954 - 1967), The University of Sydney
- Nucleus Limited (1965 - 1988)
- Nutrition Society of Australia
- Nylex Corporation Pty Ltd (1947 - )
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