Donald Grant Creighton CC FRSC (15 July 1902 – 19 December 1979) was a Canadian historian whose major works include The Commercial Empire of the St-Lawrence, 1760–1850 (first published in 1937), a detailed study on the growth of the English merchant class in relation to the St Lawrence River in Canada.

Creighton's later years were preoccupied with criticizing the then ruling Liberal Party of Canada under William Lyon Mackenzie King and his successor Louis St. Laurent.

Creighton denounced the Liberal Party for undermining Canada's link with Great Britain and moving towards closer relations with the United States, a policy which he strongly disliked.

[3] Creighton belonged to a generation of English Canadians who were proud of the British Empire, and his anglophilia was often expressed in his books.

[5] His significant contribution to the field was the development of the Laurentian thesis, which defined the basis of Canadian history through geography and the nation's dependence on its major centres.

[3] Despite heroic efforts, the dream of the St. Lawrence failed to come to life as too many impenetrable portions of the river meant it could not live up to its potential, and the development of a railroad system in the US proved to be more economical.

[3] Creighton's two most important works are The Commercial Empire of the St. Lawrence (1937) and his two-volume biography of Sir John A. Macdonald, entitled Young Politician and Old Chieftain.

[3] Creighton disliked what he called "fat funereal volumes" of unreadable biographies, and argued that well-written books should be the historian's objective.

[3] Thus for Creighton, Canadian history after 1891 was for the most part the story of missed opportunities, thwarted ambition, and hopes scattered as the dream that was Canada was slowly allowed to unravel.

[3] In contrast, Creighton saw William Lyon Mackenzie King as a weak and indecisive figure who was more concerned with safeguarding the electoral fortunes of the Liberals than winning the war, and who kept Canadian troops out of combat as long as possible to avoid difficult decisions on conscription.

"[6] This anti-Americanism moved Creighton to a growing conviction that Canada risked being absorbed by the United States culturally, economically and politically.

[9] Creighton disliked the Liberal Party as he saw the Liberals as the party of continentalism (i.e. moving Canada closer to the United States) and for taking steps that Creighton saw as an attack on Canada's British heritage, such as replacing the Canadian Red Ensign with the Maple Leaf flag in 1965.

[10] In regard to federal–provincial relations, Creighton shared Macdonald's view of a highly centralized confederation with the provinces subservient to the federal government.

In Creighton's opinion, it had been a great mistake on Ottawa’s part to allow the growth of provincial powers in the 20th century.

[11] Creighton's determination to maintain British traditions, his close association with Diefenbaker, and his dislike of continentalism led him to be accused of anti-Americanism.

[3] In Creighton's view, the so-called "Liberal Interpretation" of Canadian history would ultimately lead to Canada being absorbed into the United States.