Lewis Thomas Drummond (May 28, 1813 – November 24, 1882) was a lawyer, political figure, and judge in Lower Canada (now Quebec).

[1][2] He studied at the Séminaire de Nicolet, then articled with a leading Tory lawyer in Montreal, Charles Dewey Day.

Pierre-Dominique Debartzch had been elected to the Legislative Assembly of Lower Canada at the same time as Louis-Joseph Papineau, and like him supported the Parti canadien.

Another of Debartzch's daughters married Alexandre-Édouard Kierzkowski, who was later elected to the Legislative Assembly of the Province of Canada[1][2] After the suppression of the Lower Canada Rebellions, Drummond supported the moderate reform position of Louis-Hippolyte LaFontaine, who was campaigning for the implementation of responsible government, as recommended by Lord Durham in the Durham Report.

[10] Drummond had been re-elected to the Assembly in the general elections, this time for the Shefford constituency, defeating the incumbent member, Sewell Foster.

[1][2][10][11] In 1849, there was a growing annexationist movement centred in Montreal, calling for the peaceful annexation of the Province of Canada by the United States.

In the new ministry, headed by Francis Hincks and Augustin-Norbert Morin, Drummond was appointed Attorney General for Lower Canada and was a member of the Executive Council.

[1][2][13] The members of the new ministry from Canada East were mainly the Ministerialists, later known as the Parti bleu, which developed from the more conservative wing of the French-Canadian Group.

[1][16][17] Drummond continued to hold the position of Attorney General until 1856, when John A. Macdonald and Étienne-Paschal Taché formed a new ministry.

Macdonald and Taché instead accepted his resignation and appointed George-Étienne Cartier as Attorney General for Lower Canada.

Two years later, when George Brown and Antoine-Aimé Dorion formed a Reform–Rouge ministry, Drummond left the Bleu–Conservative grouping and switched to the Parti rouge.

[1][2][13] Under the law at that time, Drummond automatically lost his seat in the Assembly on being appointed to the Executive Council, and had to stand for re-election in a ministerial by-election, even though he was only the Attorney General for a few days.

He was also president of the Stanstead, Shefford and Chambly Railroad and helped found the Garden River Mining Company.