Is there a way to limit who can approve a pull request to a specific person?

[rklinkert]

Title says it all.

[Daniel Santos]

Hi @rklinkert

No, that is not possible. What you can do instead to restrict it a little bit is increasing the number of approvals needed for a merge to happen. This is possible through branch permissions.

Another configuration you can do is to set the default reviewers but this is just a suggestion, it does not restrict the reviewing to those people.