The Demi-Marathon Sun Life de Longueuil is an annual running event held in Longueuil, Quebec, with the 2025 edition scheduled for October 19. It features distances of 1 km, 5 km, 10 km, and 21.1 km, celebrating an Oktoberfest theme with Bavarian traditions, including feathered hats, traditional attire, sausages with sauerkraut, and Tyrolean music.

In 2025, the race also hosts the Québec 10 km Championships by Athlétisme Québec and serves as the sixth stage of the Coupe Québec Viens Courir 2025.

- Event location: Parc Michel-Chartrand, 1895 Rue Adoncour, Longueuil, QC
- Certified 10 km course by Athlétisme Canada
- Road surface
- Aid stations with water and BRIX electrolyte drinks approx. every 3 km, plus at start and finish
- Walkers welcome for distances under 15 km

- Oktoberfest theme with Bavarian traditions
- Multiple race distances from 1 km to half marathon
- Hosts Québec 10 km Championships by Athlétisme Québec
- Separate medal presentations for male and female walkers
- Electrolyte BRIX drinks and water provided on course and at start/finish