| Word | Date | Name |
| Country | Title |
| OBWOCHA | 16 October 2007 | Henry OBWOCHA |
| Kenya | Minister for Planning & National Development |
| OBWOCHA | 8 May 2007 | Henry OBWOCHA |
| Kenya | Minister for Energy (Acting) |
| OBWOCHA | 20 April 2007 | Henry OBWOCHA |
| Kenya | Minister for Planning & National Development |
| OCANA | 28 November 2008 | Graciela OCANA |
| Argentina | Minister of Health |
| Ocante | 2 November 2011 | Aristides Ocante da SILVA |
| Guinea-Bissau | Minister of Civil Service, Labor, & State Modernization |
| Ocante | 27 June 2011 | Aristides Ocante da SILVA |
| Guinea-Bissau | Minister of Defense & War Veterans |
| Ocante | 3 April 2009 | Aristides Ocante da SILVA |
| Guinea-Bissau | Minister of National Education, Culture, & Science |
| Ocante | 11 April 2007 | Aristides Ocante DA SILVA |
| Guinea-Bissau | Minister of Natural Resources |
| Ocar | 24 May 2005 | Ocar BERGER Perdomo |
| Guatemala | President |
| OCHAITA | 7 April 2011 | Carlos Esteban LARIOS OCHAITA |
| Guatemala | President, Bank of Guatemala |
| OCHEKPE | 29 July 2011 | Sarah Reng OCHEKPE |
| Nigeria | Minister of Water Resources |
| Ochilo | 8 February 2006 | George Ochilo AYACKO |
| Kenya | Minister for Gender, Sports, Culture, & Social Services |
| Ochilo | 22 September 2004 | Ayacko, George Ochilo |
| Kenya | Minister for Gender, Sports, Culture, & Social Services |
| Ochir | 5 January 2011 | Ochir ENKHTSETSEG |
| Mongolia | Permanent Representative to the UN, New York |
| Ochir | 23 June 2009 | Ochir ENKHTSETSEG |
| Mongolia | Permanent Representative to the UN, New York |
| Ochir | 1 May 2009 | Ochir ENKHTSETSEG |
| Mongolia | Permanent Representative to the UN, New York |
| OCHIR | 1 October 2008 | Enkhtsetseg OCHIR |
| Mongolia | Permanent Representative to the UN, New York |
| OCHIRKHUU | 18 January 2006 | Tuvden OCHIRKHUU |
| Mongolia | Minister of Fuel & Energy |
| OCHOA | 22 July 2011 | Paquito OCHOA, Jr. |
| Philippines | Executive Secretary |
| OCHOA | 29 November 2011 | Isis OCHOA |
| Venezuela | Minister of Communal Affairs |
| OCHOA | 24 May 2010 | Isis OCHOA |
| Venezuela | Minister of the Secretariat of the Presidency |
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