John E. Lange (born 1948)[1] was the "United States Avian Influenza and Pandemic Ambassador".

Prior to retirement, John served in the U.S. Department of State as the Special Representative on Avian and Pandemic Influenza, Deputy Inspector General, Deputy Global AIDS Coordinator, and Associate Dean for Leadership and Management at the Foreign Service Institute.

As Chargé d'Affaires, he led the American Embassy in Dar es Salaam at the time of the terrorist bombing on August 7, 1998.

He worked for the Global Health Program of the Bill & Melinda Gates Foundation from 2009 to 2013.

[3] He and his wife have one daughter, who grew up in Togo, Switzerland, Tanzania, Botswana, and Northern Virginia and who received the FSYF's Una Chapman Cox Award for Domestic Community Service in 2005.