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Exhibit 21

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SUBSIDIARIES OF INTERNATIONAL SEAWAYS, INC.

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The following table lists, as of December 31, 2025, all subsidiaries of International Seaways, Inc. and all companies in which the registrant directly or indirectly owns at least a 49% interest, except for certain companies and subsidiaries which, if considered in the aggregate as a single entity, would not constitute a significant entity. All of the entities named below are corporations, unless otherwise noted.

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Company

  ​ ​ ​

Where Incorporated,
Organized or Domiciled

Albans Tanker Corporation Ltd.

​

Bermuda

Alpha Seaways MR Tanker Corporation Ltd.

​

Bermuda

Apollonas Shipping Company Ltd.

Bermuda

Asterias Crude Carrier Ltd.

​

Bermuda

Athens Product Tanker Corporation Ltd.

​

Bermuda

Batangas Tanker Corporation Ltd.

​

Bermuda

Beta Seaways MR Tanker Corporation Ltd.

​

Bermuda

Cape Seaways Ltd.

​

Marshall Islands

CPT Alliance Ltd.

​

Marshall Islands

Crystal Tanker Corporation Ltd.

​

Bermuda

Delta Aframax Corporation Ltd.

Bermuda

Delta Seaways MR Tanker Corporation Ltd.

​

Bermuda

Diamond S Shipping II LLC

​

Marshall Islands (2)

Diamond S Shipping Ltd.

Bermuda

Diamond Tanker Company LLC

​

Bermuda (3)

DSS 1 LLC

​

Bermuda (3)

DSS 2 LLC

​

Bermuda (3)

DSS 5 LLC

​

Bermuda (3)

DSS 6 LLC

​

Bermuda (3)

DSS 7 LLC

​

Bermuda (3)

DSS 8 LLC

​

Bermuda (3)

DSS A LLC

​

Bermuda (3)

DSS B LLC

​

Bermuda (3)

DSS C LLC

​

Bermuda (3)

DSS D LLC

​

Bermuda (3)

DSS Suez JV LLC

​

Marshall Islands (2)

DSS Vessel LLC

​

Marshall Islands (2)

Eagle Product Tanker Corporation Ltd.

​

Bermuda

EB Tanker Corporation Ltd.

​

Bermuda

Epicurus Shipping Company Ltd.

Bermuda

Epsilon Aframax Corporation Ltd.

​

Bermuda

Filonikis Product Carrier Ltd.

​

Bermuda

First Pacific Corporation

​

Marshall Islands

Front Tobago Shipping Corporation

​

Marshall Islands

Guayaquil Tanker Corporation Ltd.

​

Bermuda

Hal Tanker Corporation Ltd.

​

Bermuda

Harrison Tanker Corporation Ltd.

​

Bermuda

Hatteras Tanker Corporation Ltd.

Bermuda

Hendricks Tanker Company LLC

​

Bermuda (3)

Henry Tanker Company LLC

​

Bermuda (3)

Heroic Avenir Ltd.

​

Bermuda

Heroic Equuleus Ltd.

​

Bermuda

Heroic Hera Ltd.

​

Bermuda

Heroic Hercules Ltd.

​

Bermuda

Heroic Hologium Ltd.

​

Bermuda

Heroic Hydra Ltd.

​

Bermuda

Heroic Libra Ltd.

​

Bermuda

Heroic Octans Ltd.

​

Bermuda

Heroic Perseus Ltd.

​

Bermuda

Heroic Pisces Ltd.

​

Bermuda


Company

  ​ ​ ​

Where Incorporated,
Organized or Domiciled

Heroic Scutum Ltd.

​

Bermuda

Heroic Serena Ltd.

​

Bermuda

Heroic Tucana Ltd.

​

Bermuda

Iason Product Carrier Ltd.

​

Bermuda

International Seaways Operating Corporation Ltd.

​

Bermuda

International Seaways Ship Management LLC

​

Delaware (1)

Iraklitos Shipping Company Ltd.

​

Bermuda

Isiodos Product Carrier Ltd.

​

Bermuda

Jennings Tanker Corporation Ltd.

​

Bermuda

Kythnos Chartering Corporation Ltd.

​

Bermuda

Lafayette Tanker Corporation Ltd.

​

Bermuda

Leyte Product Tanker Corporation Ltd.

​

Bermuda

Liberty Tanker Company LLC

​

Bermuda (3)

Lightering LLC

​

Bermuda (3)

Lorenzo Shipmanagement Ltd.

​

Bermuda

Milos Product Tanker Corporation Ltd.

​

Bermuda

Mindanao Tanker Corporation Ltd.

​

Bermuda

Montauk Tanker Corporation Ltd.

​

Bermuda

Navarro International Ltd.

​

Bermuda

NT Suez One LLC

​

Bermuda (3)

Oak Tanker Corporation Ltd.

​

Bermuda

OIN Chartering Ltd.

​

Bermuda

Panamax International Ltd.

​

Marshall Islands

Samar Product Tanker Corporation Ltd.

​

Bermuda

Seaways Alpha LR Corporation Ltd.

​

Bermuda

Seaways Alternative Energy Holding Corporation Ltd.

​

Bermuda

Seaways Beta LR Corporation Ltd.

​

Bermuda

Seaways Delta LR Corporation Ltd.

​

Bermuda

Seaways Epsilon LR Corporation Ltd.

​

Bermuda

Seaways First AE Tanker Corporation Ltd.

​

Bermuda

Seaways Gamma LR Corporation Ltd.

​

Bermuda

Seaways Holding Corporation Ltd.

​

Bermuda

Seaways LR Holding Corporation Ltd.

​

Bermuda

Seaways Second AE Tanker Corporation Ltd.

​

Bermuda

Seaways Shipping Corporation Ltd.

​

Bermuda

Seaways Shipping II Corporation Ltd.

​

Bermuda

Seaways Shipping III Corporation Ltd.

​

Bermuda

Seaways Subsidiary VII Ltd.

​

Bermuda

Seaways Third AE Tanker Corporation Ltd.

​

Bermuda

Seaways Zeta LR Corporation Ltd.

​

Bermuda

Second Katsura Tanker Corporation Ltd.

​

Bermuda

Skopelos Product Tanker Corporation Ltd.

​

Bermuda

Titanas Product Carrier Ltd.

​

Bermuda

Triton Tanker Company LLC

​

Bermuda (3)

Tybee Tanker Company LLC

​

Bermuda (3)

White Boxwood Shipping Ltd.

​

Bermuda

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​

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(1) This entity is a Delaware limited liability company.

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(2) This entity is a Marshall Islands limited liability company.

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(3) This entity is a Bermuda limited liability company.