We have so far registered 4,539 shipyards
| Name | | Maryland Steel Co., Sparrow Point, MD, USA |
| Maryland, USA |
| Maryport, UK |
| Marystown Shipyard Ltd., Marystown, Newfoundland, Canada |
| Maschinenfabr. Delftshaven, Rotterdam |
| Mashall Bros, Newcastle, UK |
| Maskinenfabriek & Scheepswerf van P. Smit jr. NV. Rotterdam, Holland. |
| Mason Barney, Swansea, MA, USA |
| Mathiesen, Kristiania |
| Mathiesens Verft, Kristiansand |
| Matsuura Tekko Zosen, Higashino |
| Mattapoiset, New Bedford, MA, USA |
| Mattapoisett, Rochester, MA, USA |
| Matthew Pearse & Co. Stockton on Tees, England |
| Matthews Shipbuilding Co., Hoquiam, Washington, USA |
| Maudslay, Sons & Field, Greenwich, London, England |
| Maudslay & Sons, London |
| Mauritz Hulthen, Uddevalla, Sverige |
| Maxon & Fish & Co. Mystic, Connecticut, USA |
| May, Shoreham, UK |
| Mazagon Dock Ltd, Mumbai, India |
| Mc Ateer S.B., Co., Seattle, WA, USA |
| McCloskey & Co. Tampa, Fl. USA |
| McDonald, New Glasgow, Pictou, Nova Scotia, Canada |
| McDonald, St. John, New Brunswick, Canada |
