Heffern, John A., 1953-

John A. Heffern (born 1953) is an American diplomat. Heffern served as the United States Ambassador to Armenia from 2011 to 2014. After being nominated on May 18, 2011 by United States President Barack Obama, Heffern was confirmed by the U.S. Senate on September 26, 2011 and sworn in as Ambassador on October 6, 2011.

Heffern was born in Saint Louis, Missouri, the son of Elleard Buridan Heffern and Beulah "Jo" Heffern. His father served briefly in the Foreign Service, and met his wife in India. Heffern's mother is a naturalized citizen. After graduating from the Saint Louis Priory School, Heffern attended Michigan State University, receiving his B.A. in 1976.

After college, Heffern served in the office of Senator John C. Danforth (R-Mo.) as the Senator's Office Director and Research Assistant. He joined the Foreign Service in 1982 and has been a career Senior Foreign Service officer ever since. His early postings included in China, Taiwan, and Ivory Coast. He was later assigned to Kuala Lumpur, and then held postings in Washington, among them as Malaysia Desk Officer, related to Southeast Asia. From 1994 to 1996, he served as a Pearson Fellow on the Asia Subcommittee for the House International Relations Committee, for Congressman Doug Bereuter (R-Nebraska). He subsequently served as Deputy Political Counselor at the U.S. Mission to NATO (USNATO).

Following postings in the Human Resources Bureau in Washington as Executive Assistant to Under Secretary for Political Affairs and as Deputy Chief of Mission at U. S. Embassy, Jakarta, Indonesia, he reported in 2009 to the U. S. Mission to NATO as the Deputy Permanent Representative. Most recently, he has served as Deputy Chief of Mission (DCM) at USNATO, in Brussels, Belgium.

Initially, U. S. Senator Robert Menendez (D-N.J.) held up Heffern's nomination as a protest against President Barack Obama's "refusal to characterize the Turkish killing of Armenians during World War I as a 'genocide.'" At his confirmation hearing before the Senate Foreign Relations Committee, Heffern dodged the controversy by stating that "the characterization of those events...is a policy decision that is made by the President of the United States.", He was later unanimously approved by the Senate Foreign Relations Committee, and confirmed by the U. S. Senate. His term ended on December 22, 2014.

Heffern later served, for several months in 2017, as the Acting Assistant Secretary of State for European and Eurasian Affairs, before being removed in August. Thereafter, he joined Georgetown’s Institute for the Study of Diplomacy as a Senior State Department Fellow in September. His focus at Georgetown is diplomacy and social entrepreneurship, including work to connect U.S.-based organizations and their fellows with partners overseas in the governmental and non-governmental sectors.