Kathryn Lynn Wheelbarger[1] (born 1977) is an American attorney and government official, who served as Principal Deputy and Acting Assistant Secretary of Defense for International Security Affairs from 2018 to 2020.

[3] She earned a Bachelor of Arts degree in political science, graduating summa cum laude from the University of California, Los Angeles in 1999.

[2] Wheelbarger served as Assistant Secretary of Defense for International Security Affairs in an acting capacity from June to October 2017.

[10] In February 2020, President Donald Trump announced his intent to nominate Wheelbarger to serve as Deputy Under Secretary of Defense for Intelligence and Security.

[13] Reuters reported Wheelbarger's letter noted she was confident her colleagues would “continue to be guided by the U.S. Constitution and the principles of our founding, which ensure both our security and our freedom.”[14]