| Name of Company | Subsidiary Name(if applicable) |
| Hadley Shipping Co. Ltd. | |
| Hain Steam Ship Co.Ltd | |
| Hall Bros. Steam Ship Co.Ltd | |
| Harries Bros. & Co.Ltd | |
| J & C Harrison Ltd | National S.S.Co.Ltd |
| Harrison Line | T & J Harrison Ltd. The Charente Steamship Co. Ltd. |
| Hay & Sons Ltd. | |
| Head Line | G.Heyn & Sons Ltd. Ulster Steam Ship Co. |
| Headlam & Son | Rowland & Marwood Steam Ship Co. Ltd. |
| Henderson Line | P.Henderson & Co. British & Burmese Steam Navigation Co. Ltd, |
| A.F.Henry & MacGreggor Ltd | |
| H.Hogarth & Sons Ltd | Kelvin Shipping Co.Ltd |
| Holderness Steamship Co.Ltd | |
| John Holt Line Ltd. | |
| Hopemount Shipping Co. Ltd. | Scott, Mann & Fleming Ltd |
| Houlder Line | Houlder Bros. & Co. Ltd British Empire Steam Navigation Co. Ltd. Empire Transport Co. Ltd. Alexander Shipping Co. Ltd. |
| Hudson Steam Ship Co. Ltd. | |
| Hughes Holden Shipping Ltd | |
| Hull Gates Shipping Co.Ltd | Craggs & Jenkins Ltd. |
| Hunting & Son Ltd. | Eden Tankers Ltd. Northern Petroleum Tank Steamship Co. Ltd. |
| Imperial Oil Shipping Co. Ltd. | W.R.Smeltzer |
| Imperial Shipping Investment Co. Ltd. | Niarchos (London) Ltd. |
| Indo-China Steam Navigation Co. Ltd. | |
| Irish Shipping Ltd | |
| Isle of Man Shipping Co.Ltd | |
| Isles of Scilly Steam Ship Co.Ltd | C.F.Thomas |
| John I. Jacobs & Co. Ltd. | Oil & Molasses Tankers |
| Kaye Son & Co. Ltd. | "K", Walmer and Coolham Steamship Cos. Ltd Jamaica Banana Producers Steamship Co. Ltd. |
| W.S.Kennaugh & CO. | West Coast Shipping Co. Ltd. |
| King Line Ltd. | |
| Kyle Shipping Co.Ltd | Monroe Brothers |
| N.G.Kyriakides Shipping Co. Ltd. |