| Acronym | Mission name | Start date | Closing date |
| UNTSO | United Nations Truce Supervision Organization | May 1948 | Present |
| UNMOGIP | United Nations Military Observer Group in India and Pakistan | January 1949 | Present |
| UNEF I | First United Nations Emergency Force | November 1956 | June 1967 |
| UNOGIL | United Nations Observation Group in Lebanon | June 1958 | December 1958 |
| ONUC | United Nations Operation in the Congo | July 1960 | June 1964 |
| UNSF | United Nations Security Force in West New Guinea | October 1962 | April 1963 |
| UNYOM | United Nations Yemen Observation Mission | July 1963 | September 1964 |
| UNFICYP | United Nations Peacekeeping Force in Cyprus | March 1964 | Present |
| DOMREP | Mission of the Representative of the Secretary-General in the Dominican Republic | May 1965 | October 1966 |
| UNIPOM | United Nations India-Pakistan Observation Mission | September 1965 | March 1966 |
| UNEF II | Second United Nations Emergency Force | October 1973 | July 1979 |
| UNDOF | United Nations Disengagement Observer Force | June 1974 | Present |
| UNIFIL | United Nations Interim Force in Lebanon | March 1978 | Present |
| UNGOMAP | United Nations Good Offices Mission in Afghanistan and Pakistan | May 1988 | March 1990 |
| UNIIMOG | United Nations Iran-Iraq Military Observer Group | August 1988 | February 1991 |
| UNAVEM I | United Nations Angola Verification Mission I | January 1989 | June 1991 |
| UNTAG | United Nations Transition Assistance Group | April 1989 | March 1990 |
| ONUCA | United Nations Observer Group in Central America | November 1989 | January 1992 |
| UNIKOM | United Nations Iraq-Kuwait Observation Mission | April 1991 | October 2003 |
| MINURSO | United Nations Mission for the Referendum in Western Sahara | April 1991 | present |
| UNAVEM II | United Nations Angola Verification Mission II | June 1991 | February 1995 |
| ONUSAL | United Nations Observer Mission in El Salvador | July 1991 | April 1995 |
| UNAMIC | United Nations Advance Mission in Cambodia | October 1991 | March 1992 |
| UNPROFOR | United Nations Protection Force | February 1992 | March 1995 |
| UNTAC | United Nations Transitional Authority in Cambodia | March 1992 | September 1993 |
| UNOSOM I | United Nations Operation in Somalia I | April 1992 | March 1993 |
| ONUMOZ | United Nations Operation in Mozambique | December 1992 | December 1994 |
| UNOSOM II | United Nations Operation in Somalia II | March 1993 | March 1995 |
| UNOMUR | United Nations Observer Mission Uganda-Rwanda | June 1993 | September 1994 |
| UNOMIG | United Nations Observer Mission in Georgia | August 1993 | June 2009 |
| UNOMIL | United Nations Observer Mission in Liberia | September 1993 | September 1997 |
| UNMIH | United Nations Mission in Haiti | September 1993 | June 1996 |
| UNAMIR | United Nations Assistance Mission for Rwanda | October 1993 | March 1996 |
| UNASOG | United Nations Aouzou Strip Observer Group | May 1994 | June 1994 |
| UNMOT | United Nations Mission of Observers in Tajikistan | December 1994 | May 2000 |
| UNAVEM III | United Nations Angola Verification Mission III | February 1995 | June 1997 |
| UNCRO | United Nations Confidence Restoration Operation in Croatia | May 1995 | January 1996 |
| UNPREDEP | United Nations Preventive Deployment Force | March 1995 | February 1999 |
| UNMIBH | United Nations Mission in Bosnia and Herzegovina | December 1995 | December 2002 |
| UNTAES | United Nations Transitional Administration for Eastern Slavonia, Baranja and Western Sirmium | January 1996 | January 1998 |
| UNMOP | United Nations Mission of Observers in Prevlaka | January 1996 | December 2002 |
| UNSMIH | United Nations Support Mission in Haiti | July 1996 | July 1997 |
| MINUGUA | United Nations Verification Mission in Guatemala | January 1997 | May 1997 |
| MONUA | United Nations Observer Mission in Angola | June 1997 | February 1999 |
| UNTMIH | United Nations Transition Mission in Haiti | August 1997 | December 1997 |
| MIPONUH | United Nations Civilian Police Mission in Haiti | December 1997 | March 2000 |
| | UN Civilian Police Support Group | January 1998 | October 1998 |
| MINURCA | United Nations Mission in the Central African Republic | April 1998 | February 2000 |
| UNOMSIL | United Nations Observer Mission in Sierra Leone | July 1998 | October 1999 |
| UNMIK | United Nations Interim Administration Mission in Kosovo | June 1999 | Present |
| UNAMSIL | United Nations Mission in Sierra Leone | October 1999 | December 2005 |
| UNTAET | United Nations Transitional Administration in East Timor | October 1999 | May 2002 |
| MONUC | United Nations Organization Mission in the Democratic Republic of the Congo | November 1999 | Present |
| UNMEE | United Nations Mission in Ethiopia and Eritrea | July 2000 | July 2008 |
| UNMISET | United Nations Mission of Support in East Timor | May 2002 | May 2005 |
| UNMIL | United Nations Mission in Liberia | September 2003 | Present |
| UNOCI | United Nations Operation in Côte d'Ivoire | April 2004 | Present |
| MINUSTAH | United Nations Stabilization Mission in Haiti | June 2004 | Present |
| ONUB | United Nations Operation in Burundi | June 2004 | December 2006 |
| UNMIS | United Nations Mission in the Sudan | March 2005 | Present |
| UNMIT | United Nations Integrated Mission in Timor-Leste | August 2006 | Present |
| UNAMID | African Union-United Nations Hybrid Operation in Darfur | July 2007 | Present |
| MINURCAT | United Nations Mission in the Central African Republic and Chad | September 2007 | Present |
