All Facebook business pages have an owner, whether it be an individual or a business. We often come across this issue when new clients come on board and find that many businesses out there do not have complete ownership over their Facebook page.
If you have admin access to a business page, finding out the owner is simple:
If you are already a page owner, you are also a page admin. However, someone who doesn’t own the page can then be added as an admin. By adding someone as admin, you can give them full access to every feature of the page and they will be able post on your page and manage page roles and settings.
If someone else owns your page (eg an ex-employee, past owner etc) you will need to request page access by contacting Facebook support for business via https://www.facebook.com/business/help
Facebook will likely request the following from you:
• Your relationship to the Facebook page