Christoph Heusgen (born 17 March 1955) is a German diplomat who has served as chairman of the Munich Security Conference from 2022 to 2025, to be succeeded by Jens Stoltenberg.

Heusgen served as German Ambassador to the United Nations in New York from 2017 to 2021. He was Under-Secretary for Foreign and Security Policy in the German Chancellery from 2005 to 2017, and described as Angela Merkel's most influential foreign policy and security adviser. During Germany's tenure as a non-permanent member of the United Nations Security Council, Heusgen served as President of the Council in April 2019 and assumed the presidency again in July 2020, with his term ending in December 2020.

The son of pharmacists, Heusgen grew up in Neuss where he graduated from Quirinus-Gymnasium in 1973. During his high school years, he spent a year as an exchange student at Western Reserve Academy, a boarding school in Hudson, Ohio. Heusgen studied in St. Gallen, at Georgia Southern University (GSU) and at Panthéon-Assas University in Paris, and obtained a doctorate from the University of St. Gallen in 1980. Heusgen also enjoyed watching football, stating that he was a fan of FC Bayern Munich.

Heusgen joined the diplomatic service of West Germany in 1980. His first posting was in the press and economic affairs at the Consulate General in Chicago from 1983 to 1986. He served at the German Embassy in Paris until 1988, before returning to the Federal Foreign Office headquarters in Bonn, where he took on the role of Private Secretary to the Coordinator for German-French Relations Rainer Barzel from 1988 to 1990. Heusgen also held the positions of Deputy Head of the special section in charge of negotiations of the Treaty of Maastricht (1990–1992), Deputy Head in charge of European Affairs in the private office of Foreign Minister Klaus Kinkel (1993–1997).

Heusgen was later appointed Director of the Policy Unit of the High Representative Javier Solana in the General Secretariat of the Council of the European Union in Brussels from 1999 to 2005. During that time, together with Robert Cooper, he notably led efforts on drafting the first-ever European Security Strategy in 2003.

In 2005 Heusgen became Under-Secretary for Foreign and Security Policy in the German Chancellery. In this capacity, he served as chief advisor on foreign and security policy to Chancellor Angela Merkel. By the end of his term, he was the longest-serving official in this position. He was succeeded in 2017 by Jan Hecker, a former judge at the Federal Administrative Court.

In November 2016 it became known that Heusgen would succeed Harald Braun as Permanent Representative of Germany to the United Nations in New York in 2017. In that capacity, he led the country's campaign for the United Nations Security Council election in 2018. He subsequently served as the President of the United Nations Security Council in April 2019 and took up the post again in July 2020 when Germany assumed the Presidency once more.

During his time as chair of the Security Council, Heusgen notably led negotiations in July 2020 on extending aid deliveries to Syria for one year. Opposition from both Russia and China caused the council to agree on only one remaining Turkey border crossing. At the time, he told his Chinese and Russian counterparts to report to their capitals that he had asked, "How those people who gave the instructions to cut off the aid of 500,000 children... are ready to look into the mirror tomorrow."