| | URSULA HORN | 1959 | 1959 |
| | URSULA P | 1950 | 1966 |
| | URUGUAY | 1921 | 1936 |
| | URUGUYANA REEFER | 1993 | 1993 |
| | US HAMLIN | 1942 | 1945 |
| | USEDOM | 1916 | 1916 |
| | USS WAKULLA AOG 44 | 1945 | 1945 |
| | USSA | 1911 | 1911 |
| | UTE FRESE | 1950 | 1964 |
| | UTILA PRINCESS | 1957 | 1983 |
| | UTILITAS | 1978 | 2005 |
| | UTRECHT | 1880 | 1880 |
| | UTRECHT | 1909 | 1909 |
| | UTRECHT | 1916 | 1916 |
| | UTRECHT | 1947 | 1947 |
| | UTRECHT | 1949 | 1949 |
| | UTSKAR | 1918 | 1954 |
| | UTSTEIN | 1913 | 1923 |
| | UURAS | 1917 | 1932 |
| | UUS MANOKIN | 1944 | 1944 |
| | UWE KAHRS | 1985 | 1985 |
| | UZOLLA | 1940 | 1940 |