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| Name |
|
Pennant No. |
|
Information |
|
Note |
| UBRIDLED | | P11 | | CANC | | 80 |
| UGANDA | | 66 | | | | 1 |
| UGANDA | | C66 | | 1941 TX RCN 1952 AS QUEBEC BU 1961 | | 7 |
| UGANDA | | C175 | | | | 94 |
| UGIE BANK | | 4.438 | | | | 14 |
| UGIEBRAE | | FY1966 | | | | 15 |
| UIVER | | FY1720 | | DUTCH | | 15 |
| UKI | | FY.80 | | | | 56 |
| UKI RAN | | FY80 | | | | 15 |
| ULEX | | P93 | | CANC | | 80 |
| ULLESWATER | | F33 | | 1917 | | 12 |
| ULLSWATER | | FY252 | | | | 15 |
| ULLSWATER | | T252 | | | | 41 |
| ULSTER | | D83 | | 1948/53 EX R83 REN F83 | | 9 |
| ULSTER | | F83 | | | | 12 |
| ULSTER | | H09 | | | | 18 |
| ULSTER | | R83 | | | | 38 |
| ULSTER | | D23 | | BPF EX R83 REN R83 | | 9 |
| ULSTER | | F17 | | SOLD 1928 | | 12 |
| ULSTER | | D23 | | R83 | | 95 |
| ULSTER MONARCH LSI | | F69 | | | | 11 |
| ULTIMATUM | | P34 | | 1941-49 | | 80 |
| ULVA | | T248 | | | | 41 |
| ULYSSES | | D169 | | 1948/52 EX R69 REN F17 | | 9 |
| ULYSSES | | F80 | | | | 12 |
| ULYSSES | | G96 | | | | 17 |
| ULYSSES | | D24 | | BPF EX R69 REN R69 | | 9 |
| ULYSSES | | F17 | | | | 12 |
| ULYSSES | | R69 | | | | 38 |
| ULYSSES | | D24 | | R69 | | 95 |
| UMBRA | | P35 | | 1941-46 | | 80 |
| UMBRIEL | | 4.185 | | | | 14 |
| UMPIRE | | H10 | | 1920 | | 18 |
| UMPIRE | | N82 | | 1940-41 SUNK COLLISION | | 77 |
| UMPIRE | | P31 | | 1940-41 SUNK | | 80 |
| UNA | | N87 | | EX P32 1941-49 | | 77 |
| UNA | | P32 | | 1941-49 | | 80 |
| UNBEATEN | | N93 | | 1940-42 SUNK | | 77 |
| UNBENDING | | P37 | | 1941-49 | | 80 |
| UNDAUNTED | | D53 | | 1948/52 EX R53 EX D25 REN F53 | | 9 |
| UNDAUNTED | | F53 | | | | 12 |
| UNDAUNTED | | R53 | | | | 38 |
| UNDAUNTED | | D25 | | BPF EX R53 REN R53 REN F53 | | 9 |
| UNDAUNTED | | N55 | | EX P34 1940-41 SUNK | | 77 |
| UNDAUNTED | | P34 | | 1940-41 SUNK | | 80 |
| UNDAUNTED | | D25 | | R53 | | 95 |
| UNDINE | | D142 | | 1948/54 EX R42 REN F141 | | 9 |
| UNDINE | | G79 | | | | 17 |
| UNDINE | | R42 | | | | 38 |
| UNDINE | | D26 | | BPF EX R42 REN D142 | | 9 |
| UNDINE | | F03 | | 1917-28 | | 12 |
| UNDINE | | F141 | | | | 12 |
| UNDINE | | H61 | | | | 18 |
| UNDINE | | 48C | | | | 75 |
| UNDINE | | 48N | | | | 76 |
| UNDINE | | N48 | | 1937-40 SUNK | | 77 |
| UNDINE | | D26 | | R42 | | 95 |
| UNEXPECTED | | XE9 | | SUNK AS TARGET 1954 | | 87 |
| UNGAVA | | J149 | | RCN | | 22 |
| UNGAVA | | J430 | | | | 22 |
| UNICITY | | FY956 | | | | 15 |
| UNICORN | | F72 | | | | 11 |
| UNICORN | | S43 | | 1992 | | 83 |
| UNICORN | | B312 | | AIRCRAFT REPAIR | | 93 |
| UNICORN | | R108 | | LIGHT FLEET CARRIER | | 97 |
| UNICORN | | I72 | | | | 20 |
| UNION | | N56 | | 1940-42 SUNK | | 77 |
| UNION | | P35 | | 1940-41 SUNK | | 80 |
| UNIQUE | | N95 | | 1940-42 SUNK | | 77 |
| UNIQUE | | P36 | | 1940-42 SUNK | | 80 |
| UNISON | | P43 | | 1941-44 LOANED USSR AS B3 TO 1949 | | 80 |
| UNITED BOYS | | FY855 | | | | 15 |
| UNITY | | H5A | | 1918 | | 18 |
| UNITY | | H68 | | 1914 | | 18 |
| UNITY | | H87 | | 1919 | | 18 |
| UNITY | | 66C | | | | 75 |
| UNITY | | 66N | | | | 76 |
| UNITY | | N66 | | 1938-40 SUNK COLLISION | | 77 |
| UNNAMED | | L4049 | | | | 28 |
| UNNAMED | | L4050 | | | | 28 |
| UNNAMED | | L4063 | | | | 28 |
| UNNAMED | | L4098 | | | | 28 |
| UNNAMED | | L4128 | | | | 28 |
| UNNAMED | | L4129 | | | | 28 |
| UNNAMED | | L4148 | | | | 28 |
| UNNAMED | | L4156 | | | | 28 |
| UNNAMED | | L4165 | | | | 28 |
| UNNAMED | | L4025 | | | | 28 |
| UNNAMED | | L4042 | | | | 28 |
| UNNAMED | | L4045 | | | | 28 |
| UNSEEN | | S41 | | 1989 | | 83 |
| UNST | | T213 | | | | 41 |
| UNTAMED | | P58 | | EX P58 EX VITALITY 1943-46 | | 80 |
| UNTIRING | | P59 | | 1943-45 LOANED TO GREECE 1945-52 AS XIFIAS SUNK 1957 AS TARGET | | 80 |
| UPAS | | P92 | | CANC | | 80 |
| UPHOLDER | | N99 | | 1940-42 SUNK | | 77 |
| UPLIFTER | | W06 | | | | 43 |
| UPLIFTER | | A507 | | AG | | 2 |
| UPRIGHT | | N89 | | EX P38 1940-45 | | 77 |
| UPRIGHT | | P38 | | 1940-45 | | 80 |
| UPROAR | | P31 | | 1943-46 EX ULLSWATER 1940-43 | | 80 |
| UPSHOT | | P82 | | 1944-49 | | 80 |
| UPTON | | M1187 | | MS | | 31 |
| UPWARD | | P16 | | CANC | | 80 |
| URANIA | | D105 | | 1948/53 EX R05 REN F08 | | 9 |
| URANIA | | F08 | | | | 12 |
| URANIA | | R05 | | | | 38 |
| URANIA | | D27 | | BPF EX R05 REN R05 | | 9 |
| URANIA | | D27 | | R05 | | 95 |
| URCHIN | | D199 | | 1948/52 EX R99 REN F196 | | 9 |
| URCHIN | | H62 | | | | 18 |
| URCHIN | | R99 | | | | 38 |
| URCHIN | | N97 | | EX P39 1940-41 TO POLISH AS SOKOL | | 77 |
| URCHIN | | D28 | | BPF EX R99 REN R99 | | 9 |
| URCHIN | | F196 | | | | 12 |
| URCHIN | | P39 | | 1940-41 TO POLISH AS SOKOL P97 | | 80 |
| URCHIN | | D28 | | R99 | | 95 |
| URE | | D91 | | 1918/19 EX D34 | | 9 |
| URE | | D34 | | 1915/18 EX N12 REN D91 | | 9 |
| URE | | N12 | | 1914 | | 32 |
| URGE | | N17 | | EX P40 | | 77 |
| URGE | | P40 | | 1940-42 SUNK | | 80 |
| URSA | | D222 | | 1948/53 EX R22 REN F200 | | 9 |
| URSA | | H63 | | | | 18 |
| URSA | | D29 | | R22 | | 95 |
| URSA | | D29 | | BPF EX R22 REN R22 | | 9 |
| URSA | | F200 | | | | 12 |
| URSA | | R22 | | | | 38 |
| URSULA | | F95 | | | | 12 |
| URSULA | | H11 | | | | 18 |
| URSULA | | 59C | | | | 75 |
| URSULA | | 59N | | | | 76 |
| URSULA | | N59 | | 1938-40 TO USSR TO 1949 | | 77 |
| URSULA | | S43 | | 1991 | | 83 |
| URTICA | | P83 | | 1944-50 | | 80 |
| USK | | K295 | | | | 23 |
| USK | | N65 | | EX P41 1940-41 SUNK MINED | | 77 |
| USK | | P41 | | 1940-41 SUNK | | 80 |
| USK | | B277 | | FF RIVER | | 93 |
| USLTER QUEEN | | F118 | | LSFD | | 11 |
| UT PROSIM | | FY1969 | | | | 15 |
| UTHER | | P62 | | 1943-50 | | 80 |
| UTILISE | | FY1564 | | | | 15 |
| UTMOST | | N19 | | EX P42 | | 77 |
| UTMOST | | P42 | | 1940-42 SUNK | | 80 |
| UTOPIA | | P94 | | CANC | | 80 |
| UTVAER | | FY1924 | | NORWAY | | 15 |