Mont-Saint-Hilaire (French pronunciation: [mɔ̃ sɛ̃t‿ilɛʁ]) is a suburb of Montreal on the South Shore of southeastern Quebec, Canada, on the Richelieu River in the Regional County Municipality of La Vallée-du-Richelieu.

A bridge, enabling Beloeil and St. Hilaire to be connected by rail, was built in 1848 by the St. Lawrence and Atlantic Railway.

Local bus service is provided by the RTM's Vallée du Richelieu sector.

[citation needed] In 1864, Canada's worst rail disaster occurred here when a passenger train passed a red signal and fell off an open swing bridge into the Richelieu River, killing around 99 people.

[12] The South Shore Protestant Regional School Board previously served the municipality.