Louise Arbour, CC GOQ, (10 February 1947-) appointed as Canada's 31st Governor-General by Prime Minister Mark Carney in 2026.

Arbour is the former UN High Commissioner for Human Rights, a former justice of the Supreme Court of Canada and the Court of Appeal for Ontario and a former Chief Prosecutor of the International Criminal Tribunals for the former Yugoslavia and Rwanda.

She has since July 2009 served as President and CEO of the International Crisis Group.

From 1972-73, Louise Arbour was research officer for the Law Reform Commission of Canada. She then taught at Osgoode Hall Law School, York University, first as a Lecturer (1974), then as Assistant Professor (1975), Associate Professor (1977–1987), and finally as Associate Professor and Associate Dean (1987). She also was Vice-President of the Canadian Civil Liberties Association until her appointment to the Supreme Court of Ontario (High Court of Justice) in 1987 and to the Court of Appeal for Ontario in 1990.

In 1995, Madam Louise Arbour was appointed as President of a Commission of Inquiry, under the Inquiries Act, for the purpose of investigating and reporting on events at the Prison for Women in Kingston, Ontario, following allegations by prisoners of abuse.

In 1996, she was appointed Chief Prosecutor of the International Criminal Tribunal for Rwanda in Arusha and the International Criminal Tribunal for the former Yugoslavia in The Hague. In that capacity she indicted then Serbian President Slobodan Milošević for war crimes, the first time a serving head of State was called to account before an international court. Also indicted were Milan Milutinović, President of the Republic of Serbia, Nikola Šainović, Deputy Prime Minister of the Federal Republic of Yugoslavia, Dragoljub Ojdanić, Chief of the General Staff of the Armed Forces of the Federal Republic of Yugoslavia, and Vlajko Stojiljković, Minister of Internal Affairs of the Republic of Serbia.

In 1999, Prime Minister Jean Chrétien appointed Arbour to the Supreme Court of Canada.

Throughout her career, Arbour has published in the area of criminal procedure and criminal law, in both French and English. At various times, she has served as an editor for the Criminal Reports, the Canadian Rights Reporter, and the Osgoode Hall Law Journal.

Arbour has been awarded honorary doctorates by twenty-seven universities. In 2005, Arbour was awarded the Thomas J. Dodd Prize in International Justice and Human Rights, along with Justice Richard Goldstone, in recognition of her work on the International Criminal Tribunals for the former Yugoslavia and Rwanda.

She is also the subject of a 2005 fact-based Canadian-German made-for-television movie, entitled Hunt For Justice which follows her quest to indict Bosnian war criminals. Arbour was played by Canadian actress Wendy Crewson.