Vi har så langt registrert 19 628 rederier
| Navn | Grunnlagt | | W. Neumanns Rederi, Bergen | |
| Woermann Line A.G. | |
| Wollert D. Krohn, Bergen | |
| Wollert Holsts Rederi A/S, Bergen | |
| Wollert Konow, Bergen | |
| Worrall, William, Chester, UK | |
| W. Petersen, Holmestrand | |
| W. P. Lorentzen, Kristiania | |
| W. R. Carpenter Oversea Shipping Ltd., Port Moresby, New Guinea | |
| W. Selmer, Trondheim | |
| W. S. Olsen, Kragerø | |
| W. Thomsen, Kristiansand | |
| W. Thomson & Co. Leith. | |
| W. Thoresen, Lillesand | |
| W. Tynæs, Oslo | |
| Wulf Pedersen,G.,Sarpsborg | |
| W. W. E. A/S, Oslo | |
| Wågsholm, Jarle, Fosnarvåg | |
| Xilas Bros & Constantinidis | |
| Xilas Bros., Syra, Hellas | |
| Yannoulatos Brothers, Pireus, Hellas | |
| Yara Gas Ship A/S, Oslo | |
| Yara Ship A/S, Oslo | |
| Y. Collett & Mølbach, Kristiania | |
| Y. Fjeldvik & Finn Kristensen, Porsgrunn | |
