Browse Entities - I
- I. Cullen & Company (? - 1924)
- IBM Australia
- ICI Australia
- ICIANZ
- see Imperial Chemical Industries of Australia & New Zealand Limited (1928 - ) - Illawarra Coke Company (c. 1915 - 2014)
- Illawarra Co-operative Central Dairy Society Limited
- Illawarra Mutual Building Society Limited (1880 - 2015)
- IMB Bank (2015 - )
- Imlay Brothers
- Imperial Chemical Industries (Australasia) Limited (1928 - 1929)
- Imperial Chemical Industries of Australia & New Zealand Limited (1928 - )
- Industrial Acceptance Corporation
- Inland Air Services Pty Ltd (1947 - 1948)
- Insurance Institute of Western Australia (1911 - )
- Intercolonial (New Zealand) Royal Mail Company
- Intercolonial Investment, Land and Building Company Limited (1885 - )
- International Harvester Company of Australia
- Interscan Australia Limited
- Interstate Steamship Pty Ltd
- Invincible Colliery Limited
- Invincible Colliery Limited
- IOOF Australia
- Ipswich Electric Supply Company Limited (1917 - 1941)
- Ipswich Gas and Coke Company
- Ipswich Savings Bank (1861 - 1866)
- Irvinebank Mining Company
- Island Airways Limited (1947 - 1948)
- Ivanhoe Grazing Company
- Ivanhoe Station