• Data Owner or Data Controller: individual in the org who is responsible for protecting the data and holds the legal rights, defines policies
• Data Processor: the entity responsible for processing the data, typically the cloud provider
• Data Custodian: technical responsibility over the data , security, continuity, backups, restoring, etc, implementing business rules
• Data Steward: governance quality and compliance of data, ensuring the data is in the right form
• Data Subject: the individual to whom the data relates

https://destcert.com/resources/data-roles/