[6] Lametti, who previously served as Minister of Justice and Attorney General in the government of Justin Trudeau, won the seat in 2015.

[8]On July 19, Montreal city councillor Laura Palestini was selected by the Liberals as their candidate over others seeking the nomination[9] such as Eddy Kara, a political strategist,[10] Christopher Baenninger, Quebec Liberal candidate in Sainte-Marie–Saint-Jacques in 2022 and Saint-Henri–Sainte-Anne in 2023,[11] and Lori Morrison, Electoral Division 1 Commissioner of the Lester B. Pearson School Board.

[11] The party approached Charles Milliard, president of the Fédération des chambres de commerce du Québec, to run as their candidate in the by-election.

[12] On March 28, Craig Sauvé, independent city councillor for the district of Saint-Henri—Little-Burgundy—Pointe-Saint-Charles announced that he was standing for nomination for the New Democratic Party's candidate.

[15] The Bloc Québécois candidate was Louis-Philippe Sauvé, a party staffer and the former communications and administration coordinator at the Institute for Research in Contemporary Economics.

[20] The Longest Ballot Committee announced that they are targeting the LaSalle—Émard—Verdun by-election[21] resulting in 77 independent candidates affiliated to the organization running in this seat.