Nathaniel C. Fick (born June 23, 1977) is an American diplomat, technology executive, author, and former United States Marine Corps officer.

While at Dartmouth, Fick captained the cycling team to a U.S. 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 at Dartmouth, Fick attended the United States Marine Corps Officer Candidates School and was commissioned a second lieutenant upon graduating college on June 12, 1999.

He was an officer in the Amphibious Ready Group of the 15th Marine Expeditionary Unit based in Darwin, Northern Territory, training with the Australian Army for humanitarian operations deployment to East Timor until the September 11 attacks.

"[14] He testified before the United States Senate on Iraq[15] and spoke at the 2008 Democratic National Convention in Denver on August 28, 2008, the night Barack Obama accepted the presidential nomination.

[21] In November 2023, Ambassador Fick testified before the United States Senate Foreign Relations Committee on U.S. diplomacy in support of the responsible governance of artificial intelligence.

[24] Ambassador Fick and his team led the creation of the U.S. International Cyberspace and Digital Policy Strategy, released by Secretary of State Antony Blinken at the RSA Conference in San Francisco on May 6, 2024.

[12] Fick and his platoon were the subjects of a series of articles in Rolling Stone and the book Generation Kill by the embedded journalist Evan Wright.

Generation Kill was adapted by David Simon and Ed Burns into a miniseries of the same name for HBO, in which Fick is portrayed by Stark Sands.