Tweedsmuir Park established per Order in Council 715, 21 May 1938. Area expanded by inclusion of a portion of Tweedsmuir Recreation Area per OIC 395, 21 March 1989. Area expanded by inclusion of another portion of Tweedsmuir Recreation Area per Bill 53: Park Amendment Act 1995, 13 July 1995. Area expanded per Bill 29: Park Amendment Act 1997, 29 July 1997, the whole now containing 982,538 ha. Area expanded per OIC 63, 25 January 2001. Conversion of OIC to Statute designation per Bill 15-2001: Protected Areas of British Columbia Amendment Act, 2001, 11 April 2001; the whole now containing 989,616 ha. more or less.

Source: BC place name cards, or correspondence to/from BC's Chief Geographer or BC Geographical Names Office

This enormous wilderness reserve of more than 3,700 square miles was established in 1936 and named for Lord Tweedsmuir, then Governor-General of Canada. The first Baron Tweedsmuir (1875-1940) is better known as John Buchan, the author of such notable adventure stories as "The Thirty-Nine Steps" and "Greenmantle". He was Britain's director of information in World War I, and in 1927 became the MP for the Scottish universities. He was a very popular Governor-General, who made a point of visiting all parts of this huge country.

Source: Akrigg, Helen B. and Akrigg, G.P.V; 1001 British Columbia Place Names; Discovery Press, Vancouver 1969, 1970, 1973.