The Japan Rheumatism Foundation is a public interest foundation dedicated to helping reduce the impact of rheumatic diseases in Japan. Established in 1987, it works to advance understanding, care, and support for people affected by these conditions. Its activities include conducting and supporting research into rheumatic diseases and their treatment, and sharing accessible information with patients, the general public, and healthcare professionals.

The Foundation provides educational and training opportunities, including accredited programs and seminars, and operates initiatives related to professional qualifications for rheumatology staff. It also publishes information and resources, promotes public awareness through lectures and community events, and offers guidance on topics such as preparing for disasters, medicines, and finding medical institutions. For healthcare professionals, it shares training updates and information on specialist-related programs; for patients and the public, it explains rheumatic diseases, including rheumatoid arthritis. The Foundation also supports people with rheumatic diseases during disasters. Donations and supporting memberships help fund its work, alongside opportunities such as hometown tax contributions designated to support the organization.