| Honorific-Prefix: | The Honourable |
| Kenneth James Muir MacKenzie | |
| Order: | 12th |
| Office: | Attorney General of Fiji |
| Governor: | Sir Cecil Hunter Rodwell Sir Eyre Hutson |
| Term Start: | 1922 |
| Term End: | 1927 |
| Predecessor: | Sir Alfred Young |
| Successor: | Percy McElwaine |
| Order1: | Acting |
| Office1: | Chief Justice of Fiji |
| Monarch1: | George V |
| Governor1: | Sir Cecil Hunter Rodwell |
| Term Start1: | 1922 |
| Term End1: | 1923 |
| Predecessor1: | Sir Charles Davson |
| Successor1: | Sir Alfred Young |
| Birth Date: | 1 May 1882 |
| Birth Place: | British India |
| Nationality: | British |
| Spouse: | Phyllis Taylor 24 July 1915 – 3 June 1931 (his death) |
| Children: | 1 son, 1 daughter (twins) |
| Occupation: | Soldier, Lawyer, Jurist |
| Rank: | Captain |
| Unit: | Royal Munster Fusiliers |
Kenneth James Muir MacKenzie (1 May 1882 – 3 June 1931)[1] was a British soldier, lawyer, and judge. After serving initially as Solicitor General of the East Africa Protectorate from 30 November 1919,[2] he went on to serve as Attorney General of Fiji from 1922 to 1927. He acted in an interim capacity as Chief Justice of Fiji and Chief Judicial Commissioner for the Western Pacific from 1922 to 1923. He also served as a member of the Legislative Council of Fiji in 1927.[3]
Muir MacKenzie served in the 5th Battalion, Royal Munster Fusiliers, attaining the rank of Captain.[4]
Born in India,[5] Muir MacKenzie was the son of Sir John William Pitt Muir MacKenzie, an administrator in British India,[6] and Fanny Louisa Johnstone. On 24 July 1915 he married Phyllis Taylor, daughter of Henry Howard Taylor. They had twin children: Lieutenant Commander Hamish Muir MacKenzie (20 October 1917 – 18 June 1947) and Susan Muir MacKenzie (20 October 1917 – 1978).[7]
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