The Marathon de Longueuil Sun Life is a major annual running and walking event held in Longueuil, Quebec, on Montreal’s South Shore. Since its inception, the event has seen remarkable growth, drawing thousands of participants each year and surpassing 20,000 total participants by its sixth edition in 2023. The marathon is known for its vibrant atmosphere, community involvement, and inclusivity, offering a range of distances suitable for all ages and abilities.

The event is not just a race but a celebration, featuring a variety of family-friendly activities such as inflatable games, circus workshops, bubble soccer, climbing, face painting, and live performances. The certified courses allow runners to qualify for prestigious races like the Boston and New York City Marathons, making it a popular choice for both competitive athletes and recreational runners. The Marathon de Longueuil Sun Life continues to be a highlight of the local sporting calendar, fostering a spirit of health, fitness, and community engagement.

The Marathon de Longueuil Sun Life courses are set on urban roads throughout Longueuil, providing a smooth, paved surface ideal for road running. The terrain is predominantly flat, making it accessible for runners of all levels and conducive to achieving personal bests or qualifying times for major marathons. While specific elevation profiles are not published, the event is known for its fast and friendly course, certified for Boston and New York City Marathon qualification. The route typically starts and finishes at Colisée Jean-Béliveau, looping through scenic city streets and parks.

- Certified courses for Boston and New York Marathon qualification
- Six distances: 1 km, 2 km, 5 km, 10 km, 21.1 km (Half), 42.2 km (Full)
- Free family activities: inflatables, circus workshops, bubble soccer, climbing, face painting
- Festive atmosphere with live performances and community engagement
- Urban road race with smooth, paved surfaces