- W. Duffield and Co
- W. E. Cuckson & Sons Pty Ltd (c. 1950 - )
- W. Hoadley
- W. L. Meinhardt & Partners (c. 1971 - )
- W. P. Brown and Partners Pty Ltd (1953 - )
- W. Sandford Ltd
- Wackett Aerospace Centre - see Sir Lawrence Wackett Centre for Aerospace Design Technology (1991 - ), RMIT University
- Waite Agricultural Research Institute (1924 - 1991), The University of Adelaide
- Waite Campus (1991 - ), The University of Adelaide
- Wallaroo Phosphate Company (1899 - )
- The Walter and Eliza Hall Institute of Medical Research (1915 - )
- The Walter and Eliza Hall Institute of Medical Research, Autoimmunity and Transplantation Division (1996 - )
- The Walter and Eliza Hall Institute of Medical Research, Biochemistry and Biophysics Unit (1965 - 1982)
- The Walter and Eliza Hall Institute of Medical Research, Bio-chemistry Department (1927 - 1965)
- The Walter and Eliza Hall Institute of Medical Research, Cancer and Haematology Division (1996 - )
- The Walter and Eliza Hall Institute of Medical Research, Cancer Research Unit (1965 - 1996)
- The Walter and Eliza Hall Institute of Medical Research, Cellular Immunology Unit (1965 - 1996)
- The Walter and Eliza Hall Institute of Medical Research, Clinical Research Unit (1945 - 1996)
- The Walter and Eliza Hall Institute of Medical Research, Development and Neurobiology Group (1996 - 2003)
- The Walter and Eliza Hall Institute of Medical Research, Experimental Department (1960 - 1965)
- The Walter and Eliza Hall Institute of Medical Research, Experimental Pathology Unit (1966 - 1982)
- The Walter and Eliza Hall Institute of Medical Research, Genetics and Bioinformatics Division (1996 - )
- The Walter and Eliza Hall Institute of Medical Research, Immunology Division (1996 - )
- The Walter and Eliza Hall Institute of Medical Research, Immunoparasitology Unit (1981 - 1996)
- The Walter and Eliza Hall Institute of Medical Research, Infection and Immunity Division (1996 - )
- The Walter and Eliza Hall Institute of Medical Research, Lymphocyte Differentiation Unit (1981 - 1996)
- The Walter and Eliza Hall Institute of Medical Research, Molecular Biology Unit (1981 - 1996)
- The Walter and Eliza Hall Institute of Medical Research, Molecular Genetics of Cancer Division (1996 - )
- The Walter and Eliza Hall Institute of Medical Research, Structural Biology Division (2002 - )
- The Walter and Eliza Hall Institute of Medical Research, Thymus Biology Unit (1981 - 1996)
- The Walter and Eliza Hall Institute of Medical Research, Transplantation Unit (1981 - 1996)
- The Walter and Eliza Hall Institute of Medical Research, University Department of Experimental Medicine (1944 - 1951)
- The Walter and Eliza Hall Institute of Medical Research, Virus Department (1934 - 1960)
- Wangaratta Woollen Mills (1922 - 1991)
- Wargon Chapman & Associates Pty Ltd (1970s - )
- Water Mill Company (1880s - )
- Water Research Foundation of Australia (1955 - )
- Wattyl (1929 - )
- Waverley Woollen Mill (1873 - )
- Weapons Research Establishment (1955 - 1978), Commonwealth of Australia
- Weapons Systems Research Laboratory (1978 - 1991), Defence Research Centre Salisbury
- Wellcome Foundation
- Werribee Sewerage Treatment Farm
- Wesfarmers Retail Pty Ltd - see Howard Smith Limited (1914 - 2001)
- Wessberg & Tulander Pty Ltd
- West Australian Petroleum Pty Ltd (WAPET) (1952 - 2000)
- West Footscray Petrochemicals Complex (1977 - )
- West Pilbara Scheme (1960s - )
- Western Australia Forests Department, State of Western Australia
- Western Australia Public Works Department, State of Western Australia
- Western Australian Airways (1921 - 1936)
- Western Australian Chip and Pulp Pty Ltd (1969 - )
- Western Australian Department of Agriculture, State of Western Australia
- Western Australian School of Mines - see Kalgoorlie School of Mines (1902 - )
- Western District Pastoral and Agricultural Society (1859 - 1873)
- Western Hospital
- Western Lands Commission (c. 1900 - 1934)
- Western Mining Corporation Ltd (1933 - 1996)
- Westralian Forest Industries (WFI) (1950 - 2006?)
- Westwind Turbines (1984 - )
- Wheat CRC - see CRC for Value Added Wheat (2001 - )
- White Industries Limited (1971 - 1986)
- Whyalla Shipbuilding and Engineering Works
- Wildlife Australia Branch, Commonwealth of Australia
- Wilkes Station (1959 - 1969), Australian National Antarctic Research Expeditions
- Williamstown Dockyard (1854 - 1922)
- Wireless Valve Company (1932 - )
- Wivenhoe Power Station (1984 - )
- Wivenhoe Project
- WMC Resources Ltd (1996 - 2005)
- Wolsely Sheep Shearing Machine Company Pty Ltd (1889 - )
- Women and Infants Research Foundation (1996 - )
- Women's Hospital (1856 - 1954)
- Woodside Offshore Petroleum Pty Ltd (1980 - )
- Woodside Petroleum Ltd (1954 - )
- Wool Consultative Council (1945 - 1953), Commonwealth of Australia
- Wool International (1993 - 1999), Commonwealth of Australia
- Wool Research and Development Corporation (1991 - 1993), Commonwealth of Australia
- Wool Research Trust Fund (1945 - )
- Woollen Cloth Company
- The Woolmark Company Pty Ltd (1997 - )
- WoolStock Australia Limited (1999 - 2001)
- Woomera Heritage Centre
- Working Men's College (1882 - 1933)
- World Health Organization (WHO) (1948 - )
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