EXHIBIT 21 Subsidiaries of Silgan Holdings Inc. Silgan Containers Corporation Silgan Containers Manufacturing Corporation (1) Silgan Plastics Corporation 827599 Ontario Inc. (Canadian Holdco.) (2) Silgan Plastics Canada Inc. (3) 828745 Ontario Inc. (NRO, Ltd.) - ------------------ 1. Wholly-owned subsidiary of Silgan Containers Corporation. 2. Wholly-owned subsidiary of Silgan Plastics Corporation. 3. Wholly-owned subsidiary of Canadian Holdco.