Exhibit 21.1 SUBSIDIARIES OF TERAWULF INC. The registrant’s subsidiaries as of December 31, 2024 are set forth in the list below: Legal Entity Name Percentage of Voting Securities Owned Directly or Indirectly by Registrant Jurisdiction of Organization Kyalami Data LLC 100% Delaware La Lupa Data LLC 100% Delaware Lake Mariner Data LLC 100% Delaware RM 101 Inc. 100% Minnesota TeraCub Inc. 100% Delaware TeraLease LLC 100% Delaware TeraWulf Brookings LLC 100% Delaware TeraWulf Ploughwind LLC 100% Delaware TeraWulf (Thales) LLC 100% Delaware WULF Compute LLC 100% Delaware WULF Compute Lease LLC 100% Delaware