William Braucher Wood was the U.S. Envoy for International Sanctions Implementation at the Department of State. He is a former Ambassador from the United States of America to the Islamic Republic of Afghanistan and Colombia.

William B. Wood presented his credentials on April 16, 2007, to the President of Afghanistan, Hamid Karzai, and was received as the U.S. Ambassador to that nation, replacing the former US Ambassador to Afghanistan, Ronald E. Neumann. Ambassador Wood was the US Ambassador to Colombia from 2003 to 2007, the Principal Deputy Assistant Secretary of State and Acting Assistant Secretary of State in the Bureau of International Organization Affairs, with responsibility for all aspects of U.S. foreign policy at the United Nations and a number of other multilateral organizations from 1998 to 2002. Immediately before that assignment, Mr. Wood was Political Counselor at the U.S. Mission to the United Nations, where he was the chief U.S. negotiator in the Security Council.