David S. Mao

David Mao
Librarian of Congress
Acting
In office
October 1, 2015  September 14, 2016
PresidentBarack Obama
Preceded byJames Billington
Succeeded byCarla Hayden
Personal details
BornNew York City, New York, U.S.
EducationGeorge Washington University (BA)
Georgetown University (JD)
Catholic University of America (MLIS)

David S. Mao is an American law librarian serving as the 12th Librarian of the Supreme Court of the United States since 2024. Mao served as acting Librarian of Congress from September 30, 2015, until the confirmation of Carla Hayden in 2016.