M. Osman Siddique is an American politician and former diplomat. He served as the United States Ambassador to the Republic of Fiji and to the Republic of Nauru, to the Kingdom of Tonga and to Tuvalu from 1999-2001. He was the US Ambassador during the 2000 Fijian coup d’état. Siddique is believed to be the second American-Muslim to be appointed as an Ambassador from the United States; the first was Robert D. Crane, appointed by President Ronald Reagan in 1981 as U.S. ambassador to the United Arab Emirates.

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