Data Owner - the administrator/CEO/board/president of a company Data custodian - the ones taking care of the actual data - like IT staff (generally) or HR staff (for HR-related data) https://security.stackexchange.com/questions/218049/what-is-the-difference-between-data-owner-data-custodian-and-system-owner https://www.nicolaaskham.com/blog/2019/4/12/whats-the-difference-between-data-owners-and-data-custodians