Flag of British Indian Ocean Territory
|Design||A Blue Ensign with white and blue wavy lines and a palm tree rising above the British crown on the fly. |
It is understood that the flag, which was granted by Queen Elizabeth II on the 25th anniversary of the BIOT in 1990 is that of the Commissioner and has only semi-official status.
Given that it is impossible for civilians to visit the British Indian Ocean Territory, it is not clear how widely this flag is used. However, a video was released by the Naval Support Facility on Diego Garcia. It shows a scene where the flag is being flown. The only settlements on the Islands are the Anglo-American naval and air facilities.
The flag does indeed fly at Diego Garcia, along with the American Flag. Both are lowered at the end of the duty day. 
The palm tree and crown are symbols of the Indian Ocean Territory. The wavy lines depict the waters of the Indian Ocean