Mallory A. Stewart is an American attorney who had served as the Assistant Secretary of State for Arms Control, Verification, and Compliance.

Stewart obtained a Bachelor of Arts degree from Harvard College and a Juris Doctor from Stanford Law School.

[1] Starting in 2002, Stewart served as an attorney in the Legal Advisor's Office and the principal deputy assistant secretary of state for emerging security challenges and defense policy.

[2] Outside of government Stewart was an adjunct assistant professor for foreign service at Georgetown University,[3] a non-resident fellow at the Stimson Center,[4] and a manager at Sandia National Laboratories.

Stewart was nominated for the assistant secretary post for arms control on July 2, 2021, by President Joe Biden.