The RTOG is governed by the Executive Committee, the Full Member Principal Investigators, and an organization of standing committees. The scientific work of the Group is performed by the Disease Site Committees and coordinated by the Research Strategy Committee. The RTOG Constitution and Bylaws dictate the membership of the Executive, Research Strategy and Steering Committees.

Membership in the individual Disease Site, Standing, and Administrative Committees is determined by the committee chair and dictated by the resources and expertise required to carry out the objectives of the committee. If an individual is interested in participation in a Committee he/she should contact the Committee Chair in writing through the RTOG Clinical Trials Administration Office at Headquarters. The roster for each committee along with the chair and co-chair is listed on the RTOG Web site and in the RTOG Semi-Annual Meeting book.