2026 Tokyo Marathon

Join us on March 1, 2026

Register Now! Donate To This Event

This event has passed, but you can still donate or add your name to our interest list for upcoming events. Need additional assistance? Please reach out to Kat Gunsur-Smith below.

Join the Team Challenge community as one of the thousands of supporters making an impact with every mile. Every dollar raised will help support research, education, and support for inflammatory bowel disease (IBD) patients and their families.

The Tokyo Marathon, a World Marathon Major, takes runners past iconic landmarks like Tokyo Tower and Asakusa Temple. With enthusiastic crowds, efficient organization, and cool race-day weather, participants enjoy a world-class running experience through Japan’s vibrant capital.

Register Now

How it works

Start your journey as a member of Team Challenge!

Register & Commit Your registration is the first step in your Team Challenge journey. Welcome to the team!

Fundraise & Train Log in to your fundraising page and start fundraising! Use email and social media to ask friends and family to donate as you train.

Reach the Finish Line Our team will be with you each step of the way, providing tips and resources to help you reach your fundraising commitment. You've got this!

Your fundraising impact

Invested over $500M in ground-breaking research to-date

Made over 3M connections through our education, support, and advocacy programs

Shared 53,000+ publicly accessible restrooms via We Can't Wait App

Shared over 500+ recipes through our new online recipe finder, Gut Friendly Recipes