Nancy Eileen McEldowney[1] (born October 6, 1958)[2] is an American academic and diplomat who served as the national security advisor to Vice President Kamala Harris from January 20, 2021, to March 21, 2022.

[7] McEldowney has studied a number of languages, including French, Spanish, Russian, and Latin, and received professional training in Arabic, Azerbaijani, German, and Turkish.

[6][11] Overseas, McEldowney served as the ambassador to Bulgaria from 2008 to 2009, as well as the deputy chief of mission in Turkey from 2005 to 2008 and in Azerbaijan from 2001 to 2004.

[11] In July 2017, McEldowney became director of the Master of Science in Foreign Service program at Georgetown University.

[15] On December 3, 2020, it was announced that McEldowney would serve as the national security advisor to Vice President-elect Kamala Harris.