Sean Cairncross

Sean S. Cairncross
United States National Cyber Director
Nominee
Assumed office
TBD
PresidentDonald Trump
Preceded byHarry Coker
Chief Executive Officer of the Millennium Challenge Corporation
In office
June 24, 2019  January 20, 2021
PresidentDonald Trump
Succeeded byMahmoud Bah (acting)
Personal details
Born (1974-07-12) July 12, 1974
Ramsey, Minnesota, United States
Political partyRepublican

Sean Stuart Cairncross (born July 12, 1974) was the chief executive officer of the Millennium Challenge Corporation from 2019 to 2020, and a former senior adviser to U.S. President Donald Trump. Recently, he has served as the chief operating officer for the Republican National Committee.

He was nominated to be the National Cyber Director on February 11, 2025. If confirmed, he would succeed Harry Coker, the previous National Cyber Director.