David Lametti

David T. Lametti (born August 10, 1962) is a Canadian diplomat, lawyer, and former politician who has served as the Canadian ambassador to the United Nations since November 17, 2025. Lametti was previously Minister of Justice and Attorney General of Canada from 2019 to 2023. A member of the Liberal Party, he was the member of Parliament (MP) for LaSalle—Émard—Verdun from 2015 to 2024. After leaving electoral politics, he was Principal Secretary to Prime MinisterMark Carney from July to September 2025.

Born in Port Colborne, Ontario, Lametti graduated from University of Toronto and studied law at McGill University, Yale University, and Exeter College, Oxford. Prior to entering politics, he was a professor of law at McGill University, a member of the Institute of Comparative Law, and a founding member of the Centre for Intellectual Property Policy.