| | OO'Donnell, Edward B.; Ambassador, Rank of, during tenure as Special Envoy for Holocaust Issues O'Keefe, John; Ambassador, Kyrgyzstan O'Leary, John; Ambassador, to Chile Ong, John Doyle; Ambassador, Norway Ordway, John; Ambassador, Armenia Ordway, John M.; Ambassador, Kazakhstan Orozco, Cristobal; Charge d'Affaires, Brazil Owens-Kirkpatrick, Barbro; Ambassador, Niger
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