Scot Alan Marciel (born 1958)[1] is an American diplomat and served as Principal Deputy Assistant Secretary in the Bureau of East Asian and Pacific Affairs until February 2016.

He has served in various capacities abroad and in particular was the United States Ambassador to the Association of Southeast Asian Nations prior to his nomination in Indonesia.

He is a graduate of the University of California, Davis and the Fletcher School of Law and Diplomacy.

Marciel, a career member of the Senior Foreign Service, joined the State Department in 1985.

He has served in Indonesia, Vietnam, the Philippines, Hong Kong, Brazil and Turkey, as well as in the Economic Bureau's Office of Monetary Affairs.