- Albania (10, joined 2009, now 21)
- Bulgaria (11)
- Canada (1,470 at peak, now 5)
- Croatia (20, joined 2009)
- Czech Republic (97 at peak, now 9)
- Denmark (308 at peak, now 35)
- Germany (8,500 at peak, now 250)
- Greece (1,000 at peak, now 118)
- Hungary (223 at peak, now 197)
- Italy (5,000 at peak, now 600)
- Lithuania (30 at peak, now 1)
- Montenegro (2, joined 2017)
- Norway (2,300+ at peak, now 4)
- Poland (800 at peak, now 230)
- Portugal (now 4)
- Romania (62 at peak, now 60)
- Slovenia (316)
- Turkey (752 at peak, now 402)
- United Kingdom (7,000 troops at peak, now 30)
- Sweden (1,100 at peak, now 2)
- Switzerland (220 at peak, now 219)
- Moldova (45)
- Bosnia and Herzegovina (550 to 750 at peak)
- Argentina (200 at peak) – 2,000 to presentHospital (ret) + Combat Engineer company
- Georgia (182 at peak)
- Mongolia (40 at peak)
- Azerbaijan (34 at peak)
- Philippines (457 UNMIK CivPol only at peak)
- Mike Jackson (United Kingdom, 10 June 1999 – 8 October 1999)
- Klaus Reinhardt (Germany, 8 October 1999 – 18 April 2000)
- Juan Ortuño Such (Spain, 18 April 2000 – 16 October 2000)
- Carlo Cabigiosu (Italy, 16 October 2000 – 6 April 2001)
- Thorstein Skiaker (Norway, 6 April 2001 – 3 October 2001)
- Marcel Valentin (France, 3 October 2001 – 4 October 2002)
- Fabio Mini (Italy, 4 October 2002 – 3 October 2003)
- Holger Kammerhoff (Germany, 3 October 2003 – 1 September 2004)
- Yves de Kermabon (France, 1 September 2004 – 1 September 2005)
- Giuseppe Valotto (Italy, 1 September 2005 – 1 September 2006)
- Roland Kather (Germany, 1 September 2006 – 31 August 2007)
- Xavier de Marnhac (France, 31 August 2007 – 29 August 2008)
- Giuseppe Emilio Gay (Italy, 29 August 2008 – 8 September 2009)
- Markus J. Bentler (Germany, 8 September 2009 – 1 September 2010)
- Erhard Bühler (Germany, 1 September 2010 – 9 September 2011)
- Erhard Drews (Germany, 9 September 2011 – 7 September 2012)
- Volker Halbauer (Germany, 7 September 2012 – 6 September 2013)
- Salvatore Farina (Italy, 6 September 2013 – 3 September 2014)
- Francesco Figliuolo (Italy, 3 September 2014 – 7 August 2015)
- Guglielmo Luigi Miglietta (Italy, 7 August 2015 – 1 September 2016)
- Giovanni Fungo (Italy, 1 September 2016 – 15 November 2017)
- Salvatore Cuoci (Italy, 15 November 2017 – 28 November 2018)
- Lorenzo D'Addario (Italy, 28 November 2018 – present)
Note: The terms of service are based on the official list of the KFOR commanders and another article.
On 9 June 1999 the Military Technical Agreement or Kumanovo Agreement between KFOR and the Governments of the Federal Republic of Yugoslavia and the Republic of Serbia was signed by NATO General Sir Mike Jackson and Yugoslavia Colonel General Svetozar Marjanovic concluding the Kosovo War, outlining the phased withdrawal of Federal Republic of Yugoslavia and the Republic of Serbia Forces from Kosovo, gave the KFOR Commander the control of the airspace over Kosovo and pending the United Nations Security Council Resolution’s approval, deployment of KFOR to Kosovo to maintain a secure environment. 
On 10 June 1999 the United Nations Security Council adopted Resolution 1244 authorizing the deployment in Kosovo of an international civil and security presence for an initial period of 12 months and continue until the Security Council decides otherwise. The civil presence was the United Nations Mission In Kosovo (UNMIK) and the security presence was KFOR. 
Unrest in Kosovo continued following adoption of UN 1244 through 2003.
October 28, 2000 the first Municipal Assembly Elections were held.
The 2004 unrest in Kosovo was the worst ethnic violence since 1999, leaving hundreds wounded and at least 14 people dead. On 17 and 18 March 2004, a wave of violent riots swept through Kosovo, triggered by two incidents perceived as ethnically-motivated acts. The first incident, on 15 March 2004, a 18-year-old Serb, Jovica Ivić, was shot near the village of Čaglavica, an all Serb village near Pristina, Kosovo.  
On 16 March, three Albanian children drowned in the Ibar River in the village of Čabar, near the Serb community of Zubin Potok. A fourth boy survived. It was speculated that he and his friends had been chased into the river by Serbs in revenge for the shooting of Ivić the previous day, but this claim has not been proven. 
Major initiatives were undertaken to ensure that Sexual Exploitation and Abuse was accounted for and victims received support as according to some international organizations, after KFOR and other organizations were established, Kosovo became a major destination country for women and young girls. 
The 10 February 2007 protest in Kosovo resulted in 2 deaths and many injuries.
The 2008 unrest in Kosovo followed Kosovo's declaration of independence on February 17, 2008. Some Kosovo Serbs opposed to secession boycotted the move by refusing to follow orders from the central government in Pristina and attempted to seize infrastructure and border posts in Serb-populated regions. There were also sporadic instances of violence against international institutions and governmental institutions, predominantly in North Kosovo.
UNMIK was restructured in 2008 and its rule of law executive tasks were transferred to the European Union Rule of Law Mission in Kosovo (EULEX). 
The 25 August 2009 Pristina protests resulted in vehicle damages and multiple injuries.
Beginning July 2011 until 2012, a series of confrontations in North Kosovo resulting in multiple deaths and injuries.
The 2013 protests in Kosovo began with increases in electricity bills and turned into a protest against corruption.
On 19 April 2013, the Belgrade Pristina Normalization Agreement was concluded .
The 2014 student protest in Kosovo demanded the resignation or dismissal of the University of Pristina Rector.
The 2015 Kosovo protests were a series of violent protests calling for the resignation of a Minister and the passage of a bill on Trepca Mines ownership.
9 January 2016 protests wanting the government to withdraw from a border demarcation agreement with Montenegro and a agreement to set up a Community of Serb Municipalities. 
On 14 January 2017, the Belgrade-Kosovska Mitrovica train incident happened when a Serbian train was prevented from entering Kosovo.
Since the KFOR entered Kosovo in June 1999, soldiers from Austria, Belgium, Canada, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Italy, Luxembourg, Morocco, Netherlands, Norway, Poland, Portugal, Romania, Russia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey, Ukraine, the United Arab Emirates, the United Kingdom and the United States of America fell in the accomplishment of their duty.
The biggest fatal event is that of the 42 Slovak soldiers dead in a military plane crash in Hungary.
In 20 years, more than 200 NATO soldiers have lost their lives serving to ensure peace and stability for the people of Kosovo.
After the 2008 Kosovo declaration of independence the commander of NATO forces in Kosovo said on 20 February 2008 that he did not plan to step up security in the tense north despite Kosovo Serbs forcing the temporary closure of two boundary crossings between Kosovo and uncontested Serbia.
In July 2011, following the Kosovo Police's attempts to seize two border outposts and consequent clashes that followed, KFOR troops intervened.
In 2013, KFOR was involved in a rescue operation of the last restaurant bears in Kosovo. The bears are now kept at the Bear Sanctuary Prishtina.