Genesys Cloud allows users to delete contact lists that are no longer actively used by campaigns through the Admin > Outbound > List Management interface. Before deletion, all campaigns referencing the contact list must be reassigned to a different list or deleted entirely. To delete a contact list, users navigate to the Contact Lists tab, select the checkboxes for lists to delete, click Delete, and confirm the operation. The system will either complete the deletion or display an error message. Importantly, call history data is not stored within the contact list itself and remains accessible through the analytics API after deletion, enabling users to query historical call data associated with the deleted contact list as needed.