John Graham Haggart, PC (November 14, 1836 – March 13, 1913) was a Canadian politician.

This forty-year period of service in the Commons is the second-longest in Canadian history, exceeded only by Wilfrid Laurier, whose period of service (1874-1919) mostly overlaps with Haggart's.

[1] He was appointed as Postmaster General, serving in the cabinets of John A. Macdonald and John Abbott until 1892, when he switched portfolios, serving as Minister of Railways and Canals until the defeat of the Conservative government in 1896.

There is a John Haggart fonds at Library and Archives Canada.

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