Karl Winfrid Eikenberry (born November 10, 1951) is a retired United States Army lieutenant general who served as the U.S. Ambassador to Afghanistan from April 2009 to July 2011. From 2011 to 2019, he was the Director of the U.S. Asia Security Initiative at the Walter H. Shorenstein Asia-Pacific Research Center and a Stanford University professor of the practice; a member of the Core Faculty at the Center for International Security and Cooperation; and an affiliated faculty member at the Freeman Spogli Institute for International Studies, Center on Democracy, Development and the Rule of Law, and The Europe Center.