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| YEAR | DATE | EVENT | GOVERNOR |
| 1814 | Part of UK colony of Seychelles | ||
| 1903 | Part of UK colony of Maurituis | ||
| 1965 | 8 November | UK Colony of Chagos Archipelago and Diego Garcia | Julian Edward George Asquith, Earl of Oxford and Asquith |
| 1967 | Sir Hugh Selby Norman-Walker | ||
| 1969 | Sir Bruce Greatbatch | ||
| 1973 | Sir Colin Hamilton Allen | ||
| 1976 | Norman Aspin | ||
| 1979 | John Robson | ||
| 1982 | Nigel Wenban-Smith | ||
| 1985 | William Marsden | ||
| 1988 | Richard J.S. Edis | ||
| 1991 | september | Thomas George Harris | |
| 1994 | David Ross MacLennan | ||
| 1996 | Bruce Dinwiddy | ||
| 1998 | John White |