2024 LaSalle—Émard—Verdun federal by-election

A by-election was held in the federal riding of LaSalle—Émard—Verdun in Quebec, Canada, on September 16, 2024, following the resignation of incumbent Liberal MP David Lametti.

While the riding was considered a "stronghold" for the Liberals, the by-election was expected by some to be a close race between the Liberals and the NDP, who ran "well known" Montreal city councillor Craig Sauvé. The by-election was expected to be a three-way marginal with the Bloc Québécois also having strong support in the riding.

The by-election was held on the same day as one in Elmwood—Transcona in Manitoba and was considered a test for the government of Justin Trudeau. After results were announced, Trudeau said that his party had "a lot of work to do".