Sean Cairncross

{{Short description|American executive (born 1974)}}

{{BLP sources|date=June 2023}}

{{Use mdy dates|date=April 2021}}

{{Infobox officeholder

| name = Sean S. Cairncross

| image = Sean S. Cairncross.jpg

| office1 = Chief Executive Officer of the Millennium Challenge Corporation

| president1 = Donald Trump

| term_start1 = June 24, 2019

| term_end1 = January 20, 2021

| predecessor1 =

| successor1 = Mahmoud Bah (acting)

| birth_name =

| birth_date = {{birth date and age|1974|07|12}}

| birth_place = Ramsey, Minnesota, United States{{cite web |url=https://www.familysearch.org/ark:/61903/1:1:VCKQ-VC9 |title=FamilySearch.org |publisher=The Church of Jesus Christ of Latter-day Saints |accessdate=}}

| death_place =

| party = Republican

| spouse =

| children =

| education =

| awards =

| office = United States National Cyber Director

| predecessor = Harry Coker

| president = Donald Trump

| status = Nominee

| term_start = TBD

}}

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.{{cite news |title=The Far Right's Witch Hunt Inside the Trump White House |last1=Suebsaeng |first1=Asawin |last2=Markay |first2=Lachlan |url=https://www.thedailybeast.com/the-far-rights-witch-hunt-inside-the-trump-white-house |work=The Daily Beast |date=April 2, 2019 |accessdate=January 30, 2019}}{{cite news |title=The Many Ways to Leave the White House |last1=Karni |first1=Annie |last2=Haberman |first2=Maggie |url=https://www.nytimes.com/2019/01/29/us/politics/white-house-firings-resign.html |work=The New York Times |date=January 29, 2019 |accessdate=January 30, 2019}}{{Cite web|url=https://www.congress.gov/nomination/116th-congress/113|title=PN113 - Nomination of Sean Cairncross for Millennium Challenge Corporation, 116th Congress (2019-2020)|date=June 18, 2019}} 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.{{Cite web |last=Sabin |first=Sam |date=2025-02-12 |title=A former RNC executive is President Trump's pick to be national cyber director |url=https://www.axios.com/2025/02/12/trump-names-rnc-executive-national-cyber-director |access-date=2025-02-12 |website=Axios |language=en}} If confirmed, he would succeed Harry Coker, the previous National Cyber Director.