| Honorific-Prefix: | The Honourable |
| Archibald Peter McNab | |
| Order: | 6th |
| Office: | Lieutenant Governor of Saskatchewan |
| Term Start: | September 10, 1936 |
| Term End: | February 27, 1945 |
| Predecessor: | Hugh Edwin Munroe |
| Successor: | Thomas Miller |
| Governor General: | The Lord Tweedsmuir The Earl of Athlone |
| Premier: | William John Patterson Tommy Douglas |
| Office1: | Member of the Legislative Assembly of Saskatchewan for Saskatoon City |
| Term Start1: | August 14, 1908 |
| Term End1: | June 26, 1917 |
| Predecessor1: | District established |
| Successor1: | Donald Maclean |
| Term Start2: | June 9, 1921 |
| Term End2: | November 10, 1926 |
| Predecessor2: | Donald Maclean |
| Successor2: | Howard McConnell |
| Alongside2: | Harris Turner, J.T.M. Anderson |
| Birth Date: | 29 May 1864 |
| Birth Place: | Glengarry County, Canada West |
| Death Place: | Regina, Saskatchewan, Canada |
| Nationality: | Canadian |
| Party: | Liberal |
| Occupation: | Farmer, grain buyer, businessmen |
| Profession: | Politician |
| Cabinet: | Commissioner of municipal affairs (1912-1922) Minister of Public Works (1912-1922) Minister of Telephones (1922-1926) |
Archibald Peter McNab (May 29, 1864 – April 29, 1945) was the sixth Lieutenant Governor of Saskatchewan from 1936 until 1945. He was the last lieutenant-governor of the province to live in Government House.
He was born in Glengarry County, Canada West, the son of Malcolm McNab and Margaret McCrimmon,[1] and moved to Winnipeg in 1882 with his twin brother before establishing a homestead in Virden, Manitoba.[2]
Years of drought forced him to give up farming and in 1887 he became a grain buyer for Ogilvie Flour Mills. In 1892, McNab married Edith Wilson Todd.[1]
In 1902, the company transferred him to Rosthern, Saskatchewan where he invested in two grain elevators. After selling them, he moved to Saskatoon with his wife and children and established the Dominion Elevator Company. He also helped found the Saskatchewan Central Railway Company and the Saskatchewan Power Company.
He entered politics and was elected to the Saskatchewan legislature in the 1908 general election as a Liberal MLA representing Saskatoon City. In government, he was appointed commissioner of municipal affairs and became Minister of Public Works in 1912. One of his accomplishments was helping acquire the University of Saskatchewan for Saskatoon.[2] In 1922, he was also named Minister of Telephones.[1]
McNab retired from the legislature when he was appointed to the local government board in 1926 but was forced to resign in 1930 due to allegations of impropriety.
In 1936, he was appointed lieutenant-governor. As provincial viceroy he hosted King George VI and Queen Elizabeth at Government House during their 1939 royal visit to Canada.
The Saskatchewan Co-operative Commonwealth Federation was elected to government in the 1944 general election and closed Government-House in September 1944 as an austerity measure making McNab its last occupant. He was moved to the Hotel Saskatchewan, where his successors as Lieutenant-Governor also had their offices and lived.
In ill health, he resigned as lieutenant-governor on February 26, 1945. He died of pneumonia two months later.[2]
His uncle Archibald McNab was a member of the Canadian House of Commons.[1]