| Last Name, First Name | Vessel | Year |
|---|---|---|
| Matland, Knut | Penguin | 1951 |
| Matland, Sigurd | Penguin | 1951 |
| Matos, Joaquim | Lutador | 1997 |
| McCarthy, Terrance | Barbara Gail | 1961 |
| McCartney, Maynard | Eugene H. | 1975 |
| McDonald, Braz | Redstart | 1954 |
| McDonough, James | Laura A. | 1968 |
| McGhie Jr., John | Karina T. | 1962 |
| McHugh, Dennis | Marie-Gail-Barbara | 1962 |
| Medeira, Arthur | Sanson Joy | 1960 |
| Mello, Louis | Paul and Michelle | 1986 |
| Mello Jr., John | Natalie S. | 1930 |
| Mendes, James | Clara T. | 1954 |
| Merchant, Henry | Gleaner | 1919 |
| Mesquita, Antonio | Costa & Corvo | 2008 |