Marathons in Belgium

Planning a marathon in Belgium for 2026? Run Atlas lists 14 upcoming 42 km races — from big city events to scenic regional courses.

Whether you are chasing a personal best or your first finish line, comparing dates early helps you secure a start slot and build your training block around the right peak.

Use the calendar below to browse marathons month by month. August 2026 is a busy month in our listings when several races cluster on weekends.

Many runners look for a flagship race in the capital. Brussels often hosts the most iconic marathon in Belgium, but smaller towns offer quieter starts and fast, flat profiles.

Check registration windows as soon as you pick a date — popular spring and autumn weekends fill up months ahead.

World Marathon Majors in Belgium are highlighted separately — bookmark your favourites on Run Atlas and set a RaceAlert when registration opens.