William Graham Walker (born June 1, 1935) is a United States Foreign Service diplomat who served as the US ambassador to El Salvador and as the head of the Kosovo Verification Mission.

[3] By coincidence, he shares his name with a historical soldier of fortune who in the 19th century attempted to conquer parts of Central America (and was ultimately executed).

[2] In August 1997, Walker was named as a Special Representative of the Secretary General and was appointed to head the United Nations Transitional Administration for Eastern Slavonia, Baranja and Western Sirmium (UNTAES).

[8] This was a peacekeeping mission mounted by the Organization for Security and Cooperation in Europe in an attempt to halt the ongoing violence in Kosovo by verifying compliance on the part of Yugoslav forces with U.N.

"[10] On January 18, 1999, the FR Yugoslavia government accused him of "going far beyond his mandate", and of "waging a campaign of disinformation against Serbia", declaring him persona non grata and ordering him to leave the country.

[11] A week later, on the intervention by European Council and Russian Federation, Prime Minister of FR Yugoslavia Momir Bulatović froze the decision.

[citation needed] On January 15, 2009, on the 10th anniversary of the Reçak massacre, he was awarded the Golden Medal of Freedom by the President and Prime Minister of the Republic of Kosovo.