Nathaniel C. Fick, born on June 23, 1977, is a former American diplomat and technology executive, known for his work as an author and as a former United States Marine Corps officer. He gained prominence as the CEO of cybersecurity software company Endgame, Inc., and later joined Elastic NV following its acquisition of Endgame. Fick has also served as an Operating Partner at Bessemer Venture Partners. In 2022, he was appointed to lead the U.S. State Department's Bureau for Cyberspace and Digital Policy, a role he held until 2025.

Fick authored the memoir One Bullet Away: The Making of a Marine Officer, detailing his military experiences. The book became a New York Times bestseller and was recognized by The Washington Post as one of the 'Best Books of the Year' and by Military Times as one of the 'Best Military Books of the Decade'. He was portrayed by actor Stark Sands in the HBO miniseries Generation Kill.

Born in Baltimore, Maryland, Fick graduated with high honors from Dartmouth College in 1999, with degrees in Classics and Government. During his time at Dartmouth, he captained the cycling team to a US National Championship and wrote a senior thesis on Thucydides' History of the Peloponnesian War and its implications for American foreign policy. In 1998, after his junior year, Fick attended the United States Marine Corps Officer Candidates School and was commissioned as a second lieutenant upon graduating college. He led his platoon into Afghanistan shortly after the 9/11 attacks, playing a role in driving the Taliban from Kandahar.