Organization owners can delete teams at any time from the team's settings page.

  1. In the top right corner of GitHub, click your profile photo, then click Your profile. Profile photo

  2. On the left side of your profile page, under "Organizations", click the icon for your organization. organization icons

  3. Under your organization name, click Teams. Teams tab

  4. Select the team or teams you'd like to delete. List of teams with two teams selected

  5. Above the list of teams, use the drop-down menu and click Delete. Drop-down menu with option to change team visibility
  6. Review the team or teams that will be deleted, then click I understand, delete teams. List of teams that will be deleted and Delete teams button