John Gardiner Austin CMG | |
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| Born | 7 August 1812 |
| Died | 25 July 1900 (aged 87) |
| Occupation(s) | farmer, colonial official |
John Gardiner Austin CMG (Chinese: 柯士甸; 7 August 1812 – 25 July 1900) was a British colonial administrator. He was Lieutenant-Governor of British Honduras 1864–1867, and Colonial Secretary of Hong Kong from 1868 to 1879, acting as Administrator (acting Governor) of the colony in 1877.