Lewis Wharton MacKenzie CM, MSC, OOnt, CD (born 30 April 1940) is a Canadian retired major general, author and media commentator.

MacKenzie's forefather Israel Wharton fought as a United Empire Loyalist in the American Revolutionary War, taking part in the Battle of Waxhaws, before he subsequently settled in the Liverpool area.

[3][4] Between peacekeeping missions MacKenzie served as an instructor at the Canadian Forces Command and Staff College (1979–82) and as director of army training at St. Hubert, Que.

It found that his superiors' desire to parade his successes as a bona fide hero of the Canadian Forces had impaired his ability to supervise and control matters that were his core responsibilities.

[8][9] In February 1992, MacKenzie was named chief of staff of the United Nations peacekeeping force in former Yugoslavia, tasked with supervising the cease-fire in Croatia.

[10] He has challenged the findings of the International Criminal Tribunal for the former Yugoslavia (ICTY) and, in 2005, contested the conclusions and reasoning of the Appeal Chamber's 2004 judgment in the Krstić case that the crime of genocide was perpetrated at Srebrenica in July 1995.

[11] Srđa Pavlović of the University of Alberta, a Serbian-Montenegrin historian specializing in the political and cultural history of the South Slavs during the 19th and 20th centuries, wrote that "(s)ince mid-1990s the denying of the Srebrenica genocide has been a main feature of all of General MacKenzie's public addresses on the breakup of Yugoslavia", adding that the "majority of scholars specializing in the Balkan history and the breakup of Yugoslavia view Major General MacKenzie as a promoter of a narrative that denies Serbia's responsibility in that bloody breakup and as someone who disputes the evidence of genocide committed in Srebrenica that was presented to the ICTY in The Hague"[12] The 2000 book The Lion, the Fox, and the Eagle by Carol Off, which devotes a third of its content to MacKenzie's role in Yugoslavia, claims that MacKenzie was willfully ignorant of the Bosnian political situation and was manipulated into being a vehicle of pro-Serb propaganda.

[13] In 1993, investigative reporter and Pulitzer Prize–winning journalist Roy Gutman accused Mackenzie of having two trips to Washington D.C., one to speak in front of the Heritage Foundation and the other to appear as an expert witness for the House of Representatives Armed Services Committee, funded by SERBNET, a Serbian-American lobbyist group.

In a telephone interview with Gutman, MacKenzie responded, "It wouldn't surprise me if there was some Serbian involvement considering who initiated the contract; however I would be very disappointed if that were the case.

When MacKenzie confirmed the source of the funds was indeed SERBNET, he donated the entire fee to the Canadian Federation of Aids Research (CANFAR).

[18] Visiting the riding, Tory leader Jean Charest rhetorically asked a crowd of supporters whether MacKenzie or Sheila Copps would be a better Deputy Prime Minister, but later explained that this was an example rather than his party's selection.

Around 2011, MacKenzie unsuccessfully advocated for a plan to revive and modernize the Avro Canada Arrow interceptor aircraft as an alternative to the Lockheed Martin Lightning II multirole fighter then being considered for Canadian service.

According to an article in the 23 September 2007 Victoria Times Colonist, he is an enthusiastic, skilled, and competitive race car driver having won the 2007 Diamond Class Ontario championship for Formula Fords at the age of 67.