The Japan Marching League (JML) is the most historic walking league in Japan, comprising 19 walking events across the nation. Established in 1989, JML serves as a hub for walker交流 (interaction) and contributes to academic research on walking. The organization hosts a Walking Summit every two years and promotes walking events throughout the country, encouraging public participation. Currently, over 13,000 individuals hold JML passports, allowing them to participate in various sanctioned events upon completing a distance of over 20 kilometers, with exceptions for children and seniors.

Participants are recognized with awards based on their achievements and the number of events they attend, including medals and certificates. JML organizes a diverse range of competitions nationwide, from Hokkaido to Okinawa, providing unique experiences and fostering community engagement. With a commitment to nurturing a walking culture, JML continually supports event organizers and provides resources for participants to enjoy the spirit of walking and outdoor activities across Japan.