We have so far registered 4,559 shipyards
| Name | | Union Iron Works Co., Alameda, CA, USA |
| Union Iron Works Co, San Francisco, CA, USA |
| Union Naval de Levante SA, Valencia |
| Union S.B. Co., Baltimore, MD, USA |
| Unionwerke, Boizenburg am Elbe, Tyskland |
| United D.D.Mariners Harbor, New York |
| United Ship Yards, Montreal, Quebec, Canada |
| Universal Shipbuilding, Maizuru, Japan |
| Upper Clyde S.B. Ltd, Clydebank |
| Uraga Dock Co.Ltd., Uraga |
| Uraga Dock Co. Ltd., Yokosuka, Japan |
| Uraga Dock Ltd., Yokohama, Japan |
| Uraga Heavy Ind. Ltd., Yokohama, Japan |
| Uraga Heavy Ind. Ltd., Yokosuka, Japan |
| USA |
| Usuki Tekkosho, Saiki, Japan |
| Utska Shipyard & Wisla Shipyard, Gdansk |
| Vaagland Båtbyggeri A/S, Vågland |
| Vall & Moran v/ J. H. Moran, St. Martin, New Brunswick, Canada |
| Valmet A/B., Helsingfors, Finland |
| Valmetin Laivateollisuus O/Y, Åbo |
| Valmet O/Y Helsingin Telakka, Helsingfors |
| Valmet O/Y Pansion Telakka, Åbo |
| van der Giessen, Krimpen a/d Ijssel, Holland |
| van Diemens Land, Tasmania, Australia |
