Mary Burce Warlick (born 1957) is an Australian-born, American diplomat who was appointed Deputy Executive Director of the International Energy Agency in May 2021.

[1] A former United States career diplomat, she served as the United States Ambassador to Serbia from January 2010 to September 2012, as the U.S. Consul General in Melbourne, Australia from October 2012 to July 2014, as Principal Deputy Assistant Secretary in the Bureau of Energy Resources at the Department of State from August 2014 to September 2017, and as Acting Special Envoy and Coordinator for International Energy Affairs from January to September 2017.

Warlick was born in 1957 to a Lutheran missionary family of Willard and Elinor Burce in the Territory of Papua and New Guinea, then part of Australia.

In August 2001 Warlick assumed a new position at the U.S. Embassy in Moscow, Russia where she worked as Minister Counselor for Economic Affairs until July 2004.

She assumed a new role in August 2014 as Principal Deputy Assistant Secretary in the State Department's Bureau of Energy Resources.