Note
- Projects, the all-new projects experience, is now available. For more information about Projects, see About Projects.
- You can only create a new project (classic) for an organization, repository, or user that already has at least one project (classic). If you're unable to create a project (classic), create a project instead.
An outside collaborator is a person who isn't explicitly a member of your organization, but who has permissions to a project (classic) in your organization.
- 
In the upper-right corner of GitHub, click your profile picture, then click Organizations. 
- 
Click the name of your organization. 
- 
Under your organization name, click Projects.  
- 
Click Projects (classic). 
- 
In the projects list, click the name of the project (classic). 
- 
On the top-right side of the project (classic), click Menu. 
- 
Click , then click Settings.  
- 
In the left sidebar, click Collaborators. 
- 
Under "Search by username, full name or email address", type the outside collaborator's name, username, or GitHub email. 
- 
In the search results, click the correct username and click Add collaborator. 
- 
Optionally, next to the new collaborator's name, use the drop-down menu and click the desired permission level: Read, Write, or Admin.