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| Name |
|
Pennant No. |
|
Information |
|
Note |
| O10 | | P10 | | DUTCH | | 80 |
| O13 | | N13 | | DUTCH | | 77 |
| O14 | | P14 | | DUTCH | | 80 |
| O15 | | N15 | | DUTCH | | 77 |
| O19 | | S33 | | | | 98 |
| O19 | | N54 | | DUTCH | | 77 |
| O21 | | S48 | | | | 98 |
| O21 | | P21 | | DUTCH | | 80 |
| O22 | | P22 | | DUTCH | | 80 |
| O23 | | S49 | | | | 98 |
| O23 | | P23 | | DUTCH | | 80 |
| O24 | | S50 | | | | 98 |
| O24 | | P24 | | DUTCH | | 80 |
| O9 | | P9 | | DUTCH | | 80 |
| OAK | | H12 | | 1914/15 | | 18 |
| OAK | | H38 | | 1915/18 | | 18 |
| OAK | | H56 | | 1918/21 | | 18 |
| OAK | | H92 | | 1918/19 | | 18 |
| OAK | | T54 | | | | 41 |
| OAK LAKE | | J491 | | RCN | | 22 |
| OAKHAM CASTLE | | K530 | | | | 23 |
| OAKHAM CASTLE | | F530 | | | | 12 |
| OAKINGTON | | M1213 | | | | 31 |
| OAKLEAF 2 | | A111 | | AOR | | 2 |
| OAKLEY | | F198 | | | | 12 |
| OAKLEY | | L72 | | TO POLISH | | 26 |
| OAKOL | | X00 | | | | 44 |
| OAKOL | | X00 | | | | 45 |
| OAKOL 2 | | A300 | | AOR | | 2 |
| OAKVILLE | | K178 | | RCN | | 23 |
| OBAN | | A283 | | AG | | 2 |
| OBDURATE | | D139 | | 1948/64 EX G39 | | 9 |
| OBDURATE | | G39 | | | | 17 |
| OBDURATE | | H50 | | 1921 | | 18 |
| OBDURATE | | F06 | | 1942-58 | | 12 |
| OBEDIENT | | D248 | | 1948/62 EX G48 | | 9 |
| OBEDIENT | | G25 | | | | 17 |
| OBEDIENT | | G48 | | | | 17 |
| OBERON | | G80 | | | | 17 |
| OBERON | | 21P | | | | 75 |
| OBERON | | 21N | | | | 76 |
| OBERON | | N21 | | 1926-45 | | 77 |
| OBERON | | S09 | | 1959-87 | | 83 |
| OCEAN | | 68 | | | | 1 |
| OCEAN | | L12 | | LPH | | 27 |
| OCEAN | | R68 | | | | 39 |
| OCEAN | | R65 | | LIGHT FLEET CARRIER | | 97 |
| OCEAN BREEZE | | FY810 | | | | 15 |
| OCEAN BRINE | | 4.364 | | | | 14 |
| OCEAN EDDY | | Z143 | | | | 48 |
| OCEAN GAIN | | FY1976 | | | | 15 |
| OCEAN GUIDE | | FY1977 | | | | 15 |
| OCEAN LIFEBUOY | | FY1504 | | | | 15 |
| OCEAN LUX | | FY1503 | | | | 15 |
| OCEAN PIONEER | | FY1654 | | | | 15 |
| OCEAN RETRIEVER | | FY1925 | | | | 15 |
| OCEAN ROVER | | 4.64 | | | | 14 |
| OCEAN SALVOR | | A492 | | AG | | 2 |
| OCEAN SCOUT | | FY911 | | | | 15 |
| OCEAN SPRAY | | FY1978 | | | | 15 |
| OCEAN SWELL | | Z163 | | | | 48 |
| OCEAN TOILER | | FY1947 | | | | 15 |
| OCEAN TRANSPORT | | 4.361 | | | | 14 |
| OCEAN TREASURE | | FY1918 | | | | 15 |
| OCEAN VIEW | | FY863 | | | | 15 |
| OCEAN VIM | | FY951 | | | | 15 |
| OCEAN’S GIFT BELGIUM | | 4.8 | | | | 14 |
| OCEANWAY | | F143 | | LSC | | 11 |
| OCELOT | | S17 | | 1962-91 TX CHATHAM | | 83 |
| OCKHAM | | M2714 | | | | 31 |
| OCTAVIA | | G71 | | | | 17 |
| OCTAVIA | | J280 | | | | 22 |
| OCTAVIA | | J290 | | | | 22 |
| OCTAVIA | | M290 | | | | 31 |
| ODBERG | | T25 | | SANF | | 41 |
| ODBURG | | T465 | | | | 41 |
| ODERIN | | FY1763 | | | | 15 |
| ODIHAM | | M2783 | | | | 31 |
| ODIN | | 84P | | | | 75 |
| ODIN | | 84N | | | | 76 |
| ODIN | | J461 | | CANC | | 22 |
| ODIN | | N84 | | 1928-40 SUNK | | 77 |
| ODIN | | S10 | | 1960-91 | | 83 |
| ODOMBIA | | F135 | | | | 11 |
| ODZANI | | F356 | | | | 12 |
| ODZANI | | K356 | | | | 23 |
| ODZANI | | B272 | | FF RIVER | | 93 |
| OFFA | | D96 | | 1916 HULKED YEOMAN | | 9 |
| OFFA | | D129 | | 1948/49 EX G29 | | 9 |
| OFFA | | G29 | | C1941 | | 17 |
| OGANO | | FY803 | | | | 15 |
| OHM | | FY561 | | | | 15 |
| OILPRESS | | Y21 | | AG | | 47 |
| OILSTONE | | Y22 | | | | 47 |
| OILWELL | | Y23 | | | | 47 |
| OKINO | | Z146 | | | | 48 |
| OKS0Y II | | T200 | | NORWAY | | 41 |
| OKU | | FY660 | | | | 15 |
| OLCADES | | X18 | | | | 44 |
| OLCADES | | X18 | | | | 45 |
| OLEANDER | | X46 | | | | 45 |
| OLEANDER 3 | | A124 | | AOR | | 2 |
| OLIGARCH | | X12 | | | | 44 |
| OLIGARCH | | X12 | | | | 45 |
| OLIVAE | | FY926 | | | | 15 |
| OLIVE | | FY1599 | | | | 15 |
| OLIVE | | T126 | | | | 41 |
| OLIVE CAM | | FY76 | | RAN | | 15 |
| OLIVE CAM | | FY.76 | | | | 56 |
| OLIVE TREE | | FY1946 | | | | 15 |
| OLMEDA | | A124 | | AOR | | 2 |
| OLMEDA | | A124 | | AOR | | 2 |
| OLNA | | X47 | | | | 45 |
| OLNA | | B516 | | AO | | 93 |
| OLNA 2 | | A216 | | EX HMS AOR | | 2 |
| OLNA 3 | | A123 | | AOR | | 2 |
| OLNA II | | X116 | | | | 45 |
| OLVINA | | FY154 | | | | 15 |
| OLWEN | | X09 | | | | 44 |
| OLWEN | | X09 | | | | 45 |
| OLWEN | | A122 | | AOR | | 2 |
| OLWEN 2 | | A122 | | EX OLYNTHUS 2 AOR | | 2 |
| OLYMPIA | | FY1586 | | | | 15 |
| OLYMPUS | | 35P | | | | 75 |
| OLYMPUS | | 35N | | | | 76 |
| OLYMPUS | | N35 | | 1928-42 SUNK | | 77 |
| OLYMPUS | | S12 | | 1961-89 TX CANADA | | 83 |
| OLYNTHUS | | X11 | | | | 44 |
| OLYNTHUS | | X11 | | | | 45 |
| OMBRA | | 4.66 | | | | 14 |
| OMDURMAN | | I98 | | CANC | | 21 |
| OMH | | A285 | | AG | | 2 |
| ON SLOW | | G17 | | EX PAKENHAM | | 17 |
| ONE ACCORD | | FY983 | | | | 15 |
| ONETOS | | FY761 | | | | 15 |
| ONORA | | 4.338 | | | | 14 |
| ONRUST | | B95 | | | | 5 |
| ONSLAUGHT | | D204 | | 1948/51 ex G04 | | 9 |
| ONSLAUGHT | | D04 | | 1948/49 EX G04 | | 9 |
| ONSLAUGHT | | G04 | | EX PATHFINDER | | 17 |
| ONSLAUGHT | | S14 | | 1960-91 | | 83 |
| ONSLOW | | D49 | | 1948/49 EX G17 | | 9 |
| ONSLOW | | F09 | | | | 12 |
| ONTARIO | | 53 | | EX MINOTAUR | | 1 |
| ONTARIO | | C53 | | RCN EX MINOTAUR 1943 1944-59 | | 7 |
| ONTARIO | | C184 | | HMCS | | 94 |
| ONWARD | | FY887 | | | | 15 |
| ONYX | | J221 | | | | 22 |
| ONYX | | M221 | | | | 31 |
| ONYX | | S21 | | 1966-90 MUSEUM SHIP | | 83 |
| OOSTEWAL | | T08 | | | | 41 |
| OOSTEWAL | | T80 | | SANF | | 41 |
| OPAL | | G19 | | C1917 | | 17 |
| OPHELIA | | G58 | | | | 17 |
| OPHELIA | | T05 | | | | 41 |
| OPHIR; ELDORADO | | Z235 | | | | 48 |
| OPOSSUM | | D62 | | 1918/20 EX D99 | | 9 |
| OPOSSUM | | D99 | | 1915/18 EX D12 REN D63 | | 9 |
| OPOSSUM | | F33 | | | | 12 |
| OPOSSUM | | B292 | | SLOOP BLACK SWAN | | 93 |
| OPOSSUM | | D12 | | 1914/15 REN D99 | | 9 |
| OPOSSUM | | U33 | | | | 42 |
| OPOSSUM | | S19 | | 1963-96 | | 83 |
| OPPORTUNE | | D180 | | 1948/55 EX G80 | | 9 |
| OPPORTUNE | | G80 | | | | 17 |
| OPPORTUNE | | S20 | | 1964-93 | | 83 |
| ORACLE | | D46 | | 1916/21 | | 9 |
| ORACLE | | F08 | | | | 12 |
| ORACLE | | FY.020 | | | | 13 |
| ORACLE | | S16 | | 1961-97 | | 83 |
| ORANAISE | | Z219 | | | | 48 |
| ORANGELEAF | | X40 | | | | 45 |
| ORANGELEAF 2 | | A80 | | AOR | | 2 |
| ORANGELEAF 3 | | A110 | | AOR | | 2 |
| ORANGEVILLE | | K491 | | RCN | | 23 |
| ORARA RAN | | J130 | | | | 22 |
| ORCADIA | | J462 | | | | 22 |
| ORCADIA | | D30 | | REN G80 1917 | | 9 |
| ORCADIA | | G80 | | 1917 | | 17 |
| ORCADIA | | M462 | | | | 31 |
| ORCHIS | | K76 | | LOST | | 23 |
| ORESTES | | G61 | | 1917 | | 17 |
| ORESTES | | J277 | | | | 22 |
| ORESTES | | M277 | | | | 31 |
| ORFASY | | T204 | | | | 41 |
| ORFORD NESS | | F67 | | | | 11 |
| ORIANA | | H94 | | 1919 | | 18 |
| ORIANA | | H34 | | C1917 | | 18 |
| ORIANA | | W117 | | | | 43 |
| ORIBI | | G66 | | EX OBSERVER | | 17 |
| ORIENTAL STAR | | FY178 | | | | 15 |
| ORILLIA | | K119 | | RCN | | 23 |
| ORIOLE | | G44 | | | | 17 |
| ORIOLE | | J110 | | | | 22 |
| ORION | | 85 | | | | 1 |
| ORION | | C85 | | | | 7 |
| ORISSA | | J200 | | RIN | | 22 |
| ORIZABA | | FY1897 | | | | 15 |
| ORIZABA | | Y7.23 | | | | 46 |
| ORKAN | | G90 | | POLISH LOST | | 17 |
| ORKLA | | Y3.5 | | | | 53 |
| ORKNEY | | B638 | | | | 93 |
| ORKNEY | | K448 | | RCN | | 23 |
| ORKNEY | | P299 | | PP | | 37 |
| ORMONDE | | FY782 | | LOST | | 15 |
| ORONSAY | | T375 | | | | 41 |
| ORONSAY | | A284 | | AG | | 2 |
| ORPHEUS | | H28 | | 1916 | | 18 |
| ORPHEUS | | FY1780 | | | | 15 |
| ORPHEUS | | 46P | | | | 75 |
| ORPHEUS | | 46N | | | | 76 |
| ORPHEUS | | N46 | | 1929-40 SUNK | | 77 |
| ORPHEUS | | S11 | | 1959-94 | | 83 |
| ORSAY | | J450 | | | | 22 |
| ORSAY | | M450 | | | | 31 |
| ORVICTO | | FY909 | | | | 15 |
| ORWELL | | D49 | | 1914/15 REN D86 | | 9 |
| ORWELL | | D63 | | 1918/20 EX D86 | | 9 |
| ORWELL | | D86 | | 1915/18 EX D49 REN D63 | | 9 |
| ORWELL | | D198 | | 1948/52 EX G98 REN F98 | | 9 |
| ORWELL | | F98 | | | | 12 |
| ORWELL | | G98 | | | | 17 |
| ORWELL | | M2011 | | | | 31 |
| ORZEL | | 85A | | POLISH CREWED 1939-40 LOST 1940 | | 59 |
| ORZEL | | 85A | | POLISH CREWED 193940 LOST 1940 | | 75 |
| ORZEL | | 85N | | POLISH CREWED 193940 LOST 1940 | | 76 |
| ORZEL | | N85 | | POLISH | | 77 |
| OSAKO | | FY580 | | | | 15 |
| OSCAR ANGELA | | 4.22 | | | | 14 |
| OSHAWA | | J330 | | RCN | | 22 |
| OSIRIS | | 67P | | | | 75 |
| OSIRIS | | 67N | | | | 76 |
| OSIRIS | | N67 | | 1928-46 | | 77 |
| OSIRIS | | S13 | | 1962-92 | | 83 |
| OSPREY | | D64 | | | | 9 |
| OSPREY | | P80 | | 1914 | | 36 |
| OSSORY | | HA5 | | 1915 | | 18 |
| OSSORY | | J463 | | | | 22 |
| OSSORY | | M463 | | | | 31 |
| OSTETWAL | | T508 | | | | 41 |
| OSWALD | | 58P | | | | 75 |
| OSWALD | | 58N | | | | 76 |
| OSWALD | | N58 | | 1928-40 SUNK | | 77 |
| OTAGO RNZN | | F111 | | | | 12 |
| OTHELLO | | T76 | | | | 41 |
| OTTAWA (I) | | H60 | | RCN EX CRUSADER LOST | | 18 |
| OTTAWA II | | H31 | | RCN EX GRIFFIN | | 18 |
| OTTER | | S15 | | 1962-92 | | 83 |
| OTTRINGHAM | | M2715 | | | | 31 |
| OTUS | | 92P | | | | 75 |
| OTUS | | 92N | | | | 76 |
| OTUS | | N92 | | 1928-46 | | 77 |
| OTUS | | S18 | | 1962-92 MUSEUM SHIP | | 83 |
| OTWAY | | 51P | | | | 75 |
| OTWAY | | 51N | | | | 76 |
| OTWAY | | N51 | | 1931-45 EX RAN | | 77 |
| OUDENARDE | | I02 | | | | 21 |
| OUDH | | J245 | | RIN | | 22 |
| OULSTON | | M1129 | | | | 31 |
| OUR BAIRNS | | FY1566 | | | | 15 |
| OUR KATE | | FY1883 | | | | 15 |
| OURAGAN | | H16 | | FRENCH | | 18 |
| OURAGAN | | H16 | | POLISH | | 18 |
| OUSE | | D66 | | 1918 EX D28 RENH80 | | 9 |
| OUSE | | T80 | | | | 41 |
| OUSE | | D28 | | 1915/18 EX N69 REN D66 | | 9 |
| OUSE | | N69 | | 1914 | | 32 |
| OUTARDE | | J161 | | RCN | | 22 |
| OUTREMONT | | K322 | | RCN | | 23 |
| OUTREMONT | | B639 | | FF RIVER | | 93 |
| OVERFALL | | FY984 | | | | 15 |
| OVERTON | | M1197 | | | | 31 |
| OWEN S | | A311 | | AGS | | 2 |
| OWEN SOUND | | K340 | | RCN | | 23 |
| OWERA | | FY1002 | | | | 15 |
| OWL | | H31 | | 1914 | | 18 |
| OWL | | H84 | | 1919 | | 18 |
| OWL | | H93 | | 1918 | | 18 |
| OXFORD CASTLE | | F692 | | | | 12 |
| OXFORD CASTLE | | K692 | | | | 23 |
| OXLEY | | 55P | | | | 75 |
| OXLEY | | 55N | | | | 76 |
| OXLEY | | N55 | | 1931-39 SUNK EX RAN | | 77 |
| OXLIP | | K123 | | | | 23 |
| OXNA | | T296 | | | | 41 |
| OYSTERMOUTH CASTLE | | 4.101 | | | | 14 |