- GitHub の任意のページの右上隅にあるプロフィール写真をクリックし、[ Settings] をクリックします。
 - サイドバーの [Access] セクションの [Organizations] をクリックします。
 - Under "Organizations", next to the organization you'd like to remove yourself from, click Leave.
 
Removing yourself from an organization
If you're an outside collaborator or a member of an organization, you can leave the organization at any time.