Sir Christopher John Greenwood (born 12 May 1955) is Master of Magdalene College, Cambridge and a former British judge at the International Court of Justice.

[3] In 2018 Queen's Birthday Honours, he was appointed Knight Grand Cross of the Order of the British Empire (GBE) for services to international justice.

The legal opinion, which he signed in his capacity as a law professor, has been used to justify that the invasion by Britain, the United States and allied powers was sanctioned by the UN Security Council.

However, the opinion was concluded in the month before the adoption of United Nations Security Council Resolution 1441 and the conclusion was stated to be dependent on one of three conditions being satisfied.

"[5] Greenwood acted as counsel for the government of the United Kingdom in relation to a number of cases in both domestic and international courts: the Ojdanic case in the International Criminal Tribunal for the Former Yugoslavia; Federal Republic of Yugoslavia v. United Kingdom in the International Court of Justice; the General Assembly request to the ICJ for an advisory opinion on the Palestinian wall (UK observations on admissibility); R (on the application of the European Roma Rights Centre and others) v. Immigration Officer at Prague Airport and others; and R (on the application of Abbasi and Mubanga) v. the Secretary of State for Foreign and Commonwealth Affairs and others.

Nawaf Salam from Lebanon surprisingly contested and won the seat kept previously by Indian judge Dalveer Bhandari.