The United Nations Integrated Office in Sierra Leone (UNIOSIL) was established by Resolution 1620 of the United Nations Security Council in 2005 to begin operations in 2006 as a follow-up to United Nations Mission in Sierra Leone (UNAMSIL)[1] which helped end the Sierra Leone Civil War. 
It was extended twice and ended on 30 September 2008;[2] it was replaced with the United Nations Integrated Peacebuilding Office in Sierra Leone (UNIPSIL).[3] 
 References
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| Past missions | | Africa |  - UNOB (1993–2004)
  - UNPOS (1995–2013)
  - UNOL (1997–2003)
  - UNOA (1999–2002)
  - UNOGBIS (1999–2009)
  - BONUCA (2000–2009)
  - UNOWA (2001–2016)
  - UNMA (2002–2003)
  - MINUCI (2003–2004)
  -  (2005–2008)
  - BINUB (2006–2010)
  - UNIPSIL (2008–2014)
  - BINUCA (2009–2014)
  - International Commission of Inquiry on the events of 28 September 2009 in Guinea (2009–2010)
  - BNUB (2011–2014)
  - OSES (2013–2016)
  - UNSOM (2013–2024)
  - MENUB (2015)
  - Good Offices Sudan and South Sudan (2016–2018)
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 | Americas |  - Good Offices Guyana - Venezuela (1990–2017)
  - MICIVIH (1993–1999)
  - MINUGUA (1994–2004)
  - MINUSAL (1995)
  - UNOV (1996)
  - MICAH (2000–2001)
  - United Nations Mission in Colombia (2016–2017)
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 | Asia & Pacific |  - UNPOB (1998–2003)
  - UNAMET (1999)
  - UNOMB (2004–2005)
  - UNOTIL (2005–2006)
  - UNMIN (2007–2010)
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 | Europe |  - Good Offices Greece-FYROM (1993–2019)
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 | Middle East & West Asia |  | 
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| Current missions | | Africa |  - Personal Envoy Western Sahara (1997)
  - UNOWAS (2002)
  - UNIOGBIS (2010)
  - UNOAU (2010)
  - UNOCA (2011)
  - UNSMIL (2011)
  - Special Envoy Great Lakes Region (2013)
  - Special Envoy Burundi (2016)
  - Special Envoy Horn of Africa (2018)
  - Personal Envoy Mozambique (2019)
  - UNTMIS (2024)
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 | Americas |  | 
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 | Asia & Pacific |  | 
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 | Europe |  - Special Adviser on Cyprus (1964)
  - UNRGID (2010)
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 | Middle East & West Asia |  - UNSCO (1999)
  - UNAMA (2002)
  - UNAMI (2003)
  - Special Envoy for Implementation of Security Council Resolution 1559 (2004)
  - UNSCOL (2007)
  - UNRCCA (2007)
  - Special Envoy Syria (2012)
  - Special Envoy Yemen (2012)
  - UNMHA (2019)
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