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Exhibit 21

SUBSIDIARIES OF INTERNATIONAL SEAWAYS, INC.

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.

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


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

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

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