Longueuil—Saint-Hubert (formerly Longueuil—Pierre-Boucher and Longueuil) is a federal electoral district in Quebec, Canada, that has been represented in the Canadian House of Commons since 2004. Its population in 2001 was 96,403.

This South Shore district in the Quebec region of Montérégie includes the eastern part of the City of Longueuil and the western part of the City of Boucherville.

The neighbouring ridings are Saint-Lambert, Saint-Bruno—Saint-Hubert, Verchères—Les Patriotes, La Pointe-de-l'Île, and Hochelaga.

This mainly Francophone riding is one of the NDP's safer seats on the South Shore. The NDP did well across the district, with the BQ coming in distant second for the most part. The Liberals and Conservatives did poorly in this riding, although the Liberals had a tiny pocket of somewhat strong support around Parc Michel-Chartrand. Despite winning the riding again in 2015, it was an extremely close contest. The Liberals surged into second place, just one point away from defeating the incumbent NDP candidate.

The electoral district was created as "Longueuil" in 1952 from parts of Chambly—Rouville and Châteauguay—Huntingdon—Laprairie ridings. It was renamed "Longueuil—Pierre-Boucher" in 2004.

This riding was largely replaced with "Longueuil—Saint-Hubert", losing territory to Pierre-Boucher—Les Patriotes—Verchères and gaining territory from Saint-Bruno—Saint-Hubert during the 2012 electoral redistribution.

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