Drupal.org, the website, home of the Drupal Project, is governed by the 3 Working Groups:

Together they serve as the collective Product Owner for *.d.o, covering all the aspects of running a website, specifically questions of long-term strategic importance.

Drupal Association provides the financial and legal support for the site. The Board of the Drupal Association is the final decision maker for questions, which can't be addressed by the Working Groups.