The Fiscal Assistant Secretary of the Treasury is the highest-ranking career official in the United States Department of the Treasury.

According to statute, the Fiscal Assistant Secretary is appointed by the United States Secretary of the Treasury.

[1] The Fiscal Service, which the Fiscal Assistant Secretary heads,[2] includes the Bureau of Government Financial Operations[3] (which since 1984 has been known as the Financial Management Service and the Bureau of the Public Debt.

[4] The Fiscal Assistant Secretary is responsible for the following principal functions:[5]