| C/S | Year | C/S | Year | C/S | Year | |||||||||||
| O. 19 (D.S.) | BTNF | 1945-1948 | OKAPI | GRFS | 1945-1948 | ORION | GVTV | 1945-1948 | ||||||||
| O.10 DUTCH SUBMARINE | GWCR | 1945-1948 | OKINO | MGTS | 1945-1948 | ORION (F.S.) | GWBR | 1945-1948 | ||||||||
| O.14 DUTCH SUBMARINE | GWDD | 1945-1948 | OKSOY | BGJP | 1945-1948 | ORISSA | VWFZ | 1945-1948 | ||||||||
| O.15 DUTCH SUBMARINE | GWDG | 1945-1948 | OKU | GQKW | 1945-1948 | ORIZABA | MCTG | 1945-1948 | ||||||||
| O.21 DUTCH SUBMARINE | GWDN | 1945-1948 | OLCADES | GSBP | 1939 | ORKAN | GCQW | 1945-1948 | ||||||||
| O.23 DUTCH SUBMARINE | GWFC | 1945-1948 | OLEANDER | GSBW | 1928 | ORKLA | GFDN | 1945-1948 | ||||||||
| O.24 DUTCH SUBMARINE | GWFF | 1945-1948 | OLEANDER | GBJT | 1939 | ORMONDE | GSBK | 1928 | ||||||||
| O.9 DUTCH SUBMARINE | GWCJ | 1945-1948 | OLEANDER | GBJT | 1945-1948 | ORNEN III | BSBW | 1945-1948 | ||||||||
| OAK | GGMR | 1945-1948 | OLEANDER | MQTY | 1945-1948 | ORONSAY | MZCT | 1945-1948 | ||||||||
| OAK APPLE | BXPY | 1945-1948 | OLIGARCH | GLDF | 1939 | ORPHEE | GKLQ | 1945-1948 | ||||||||
| OAKHAM CASTLE | MZQN | 1956 | OLIGARCH | GLDF | 1945-1948 | ORPHEUS | GSBF | 1928 | ||||||||
| OAKHAM CASTLE | MZQN | 1945-1948 | OLIVAE | GYCF | 1945-1948 | ORPHEUS | GVTX | 1939 | ||||||||
| OAKLEA | GWXK | 1945-1948 | OLIVE | GGQX | 1945-1948 | ORPHEUS | GDDE | 1961 | ||||||||
| OAKLEY | GBYZ | 1956 | OLIVE CAM | VJQD | 1945-1948 | ORPHEUS | GDDE | 1964 | ||||||||
| OAKLEY | GBYX | 1945-1948 | OLIVE TREE | GJJL | 1945-1948 | ORPHEUS | BGLN | 1945-1948 | ||||||||
| OAKOL | GPSV | 1945-1948 | OLMES | MYYZ | 1945-1948 | ORSA (I.S.) | QDFK | 1945-1948 | ||||||||
| OASIS | BRYY | 1945-1948 | OLNA | GSCB | 1928 | ORSAY | MVPD | 1956 | ||||||||
| OBDURATE | GCKT | 1956 | OLNA | GJBN | 1939 | ORSAY | QCDD | 1945-1948 | ||||||||
| OBDURATE | GCKT | 1961 | OLNA | MQTR | 1945-1948 | ORVICTO | GWTN | 1945-1948 | ||||||||
| OBDURATE | GCKT | 1964 | OLVINA | GWYM | 1945-1948 | ORWELL | GSVW | 1910 | ||||||||
| OBDURATE | GCKT | 1945-1948 | OLWEN | GLDB | 1939 | ORWELL | GCFZ | 1956 | ||||||||
| OBEDIENT | GCRD | 1956 | OLWEN | GLDB | 1945-1948 | ORWELL | GCFZ | 1961 | ||||||||
| OBEDIENT | GCDR | 1961 | OLYMPIA | GYPD | 1945-1948 | ORWELL | GCFZ | 1964 | ||||||||
| OBEDIENT | GCRD | 1945-1948 | OLYMPUS | GSBV | 1928 | ORWELL | GCFZ | 1945-1948 | ||||||||
| OBERON | GSBH | 1928 | OLYMPUS | GVTS | 1939 | OSAKO | MLBJ | 1945-1948 | ||||||||
| OBERON | GXGQ | 1939 | OLYMPUS | GDBH | 1961 | OSIRIS | GSBQ | 1928 | ||||||||
| OBERON | GDDA | 1961 | OLYMPUS | GDBH | 1964 | OSIRIS | GVTY | 1939 | ||||||||
| OBERON | GDDA | 1964 | OLYNTHUS | GLDC | 1939 | OSIRIS | GJMA | 1962 | ||||||||
| OBERON | GXGQ | 1945-1948 | OLYNTHUS | GLDC | 1945-1948 | OSLEY | GVVF | 1939 | ||||||||
| OCADES | GSBP | 1945-1948 | OMBRA | MFMN | 1945-1948 | OSPREY | GSVT | 1910 | ||||||||
| OCEAN | GSVK | 1910 | OMDURMAN | QCKW | 1945-1948 | OSPREY | GSBL | 1928 | ||||||||
| OCEAN | MVNZ | 1956 | ONDINE | GWBG | 1945-1948 | OSSORY | MVPF | 1956 | ||||||||
| OCEAN | MVNZ | 1961 | ONE ACCORD | GWCV | 1945-1948 | OSSORY | QCKY | 1945-1948 | ||||||||
| OCEAN | QCKT | 1945-1948 | ONETOS | GLLY | 1945-1948 | OSTA | MFWQ | 1945-1948 | ||||||||
| OCEAN BREEZE | BXQK | 1945-1948 | ONICE (I.S.) | GYWL | 1945-1948 | OSTRICH | GSVR | 1910 | ||||||||
| OCEAN BRINE | GZYX | 1945-1948 | ONSLAUGHT | GHA | 1961 | OSWALD | GSBR | 1928 | ||||||||
| OCEAN EDDY | GYCD | 1945-1948 | ONSLAUGHT | GHGA | 1964 | OSWALD | GVTZ | 1939 | ||||||||
| OCEAN GAIN | MQQG | 1945-1948 | ONSLAUGHT | GCDK | 1945-1948 | OTARIA (I.S.) | GYXS | 1945-1948 | ||||||||
| OCEAN GIFT | BDJC | 1945-1948 | ONSLOW | GBXX | 1945-1948 | OTTAWA H.M.C.S. | CGBQ | 1939 | ||||||||
| OCEAN GUIDE | MQQJ | 1945-1948 | ONTARIO | MWSK | 1945-1948 | OTTER | GSWC | 1910 | ||||||||
| OCEAN LIFEBUOY | GWTK | 1945-1948 | ONWARD | MCYL | 1945-1948 | OTTER | GHQZ | 1964 | ||||||||
| OCEAN LUX | GWTF | 1945-1948 | ONYX | GVMS | 1939 | OTTER HOUND | MNVZ | 1945-1948 | ||||||||
| OCEAN PIONEER | GWXJ | 1945-1948 | ONYX | GGKD | 1956 | OTUS | GSBT | 1928 | ||||||||
| OCEAN PRIDE | BXQL | 1945-1948 | ONYX | GGKD | 1961 | OTUS | GVVB | 1939 | ||||||||
| OCEAN RANGER | BBCN | 1945-1948 | ONYX | GGKD | 1964 | OTUS | GHWP | 1964 | ||||||||
| OCEAN ROVER | MKQX | 1945-1948 | ONYX | GLXU | 1964 | OTUS | GVVB | 1945-1948 | ||||||||
| OCEAN SALVOR | BGSW | 1945-1948 | ONYX | BGJW | 1945-1948 | OTWAY | GSBM | 1928 | ||||||||
| OCEAN SCOUT | GKKC | 1945-1948 | OOSTWEAL | ZTBN | 1945-1948 | OTWAY | GVVC | 1939 | ||||||||
| OCEAN SPRAY | MQPM | 1945-1948 | OPHELIA | GQBQ | 1945-1948 | OTWAY | GVVC | 1945-1948 | ||||||||
| OCEAN SWELL | GKKD | 1945-1948 | OPOSSUM | GSVQ | 1910 | OUDENARDE | QCKZ | 1945-1948 | ||||||||
| OCEAN TOILERS | GLGW | 1945-1948 | OPOSSUM | GJLZ | 1962 | OUDH | VWKM | 1945-1948 | ||||||||
| OCEAN TREASURE | GWXG | 1945-1948 | OPOSSUM | QCDC | 1945-1948 | OULSTON | GSCC | 1956 | ||||||||
| OCEAN VIEW | GKWW | 1945-1948 | OPPORTUNE | GBXY | 1956 | OULSTON | GSCC | 1961 | ||||||||
| OCEAN VIM | GWTG | 1945-1948 | OPPORTUNE | GBXY | 1945-1948 | OULSTON | GSCC | 1964 | ||||||||
| OCEANIC | MFLB | 1945-1948 | OPPOSSUM | MVPB | 1956 | OUR BAIRNS | GSVF | 1945-1948 | ||||||||
| OCEANWAY | MZBR | 1945-1948 | ORACLE | GHQY | 1964 | OUR KATE | GKLT | 1945-1948 | ||||||||
| OCELOT | GHWN | 1964 | ORACLE | GKKY | 1945-1948 | OUR KATIE | BXQM | 1945-1948 | ||||||||
| OCKHAM | GVLQ | 1961 | ORANAISE | GPLW | 1945-1948 | OURAGAN | GSXG | 1945-1948 | ||||||||
| OCKHAM | GVLQ | 1964 | ORANGE NASSAU | BDJV | 1945-1948 | OUSE | GSWH | 1910 | ||||||||
| OCTAVIA | MRZV | 1945-1948 | ORANGELEAF | GSCD | 1928 | OUSE | GSBJ | 1928 | ||||||||
| OCTEN | GSBP | 1928 | ORANGELEAF | GVTT | 1939 | OUSE | GVVD | 1939 | ||||||||
| ODBERG | ZTCL | 1945-1948 | ORANGELEAF | GVTT | 1945-1948 | OUTPOST (F.C.) | MRYY | 1945-1948 | ||||||||
| ODERIN | BDMD | 1945-1948 | ORCADIA | MVPC | 1956 | OVERFALL | MQWM | 1945-1948 | ||||||||
| ODIHAM | MTYR | 1956 | ORCADIA | QCKX | 1945-1948 | OVERTON | GTWL | 1956 | ||||||||
| ODIHAM | MTYR | 1961 | ORCHIS | GGZG | 1945-1948 | OWEN | MRXK | 1956 | ||||||||
| ODIHAM | MTYR | 1964 | ORESTES | GGMY | 1956 | OWEN | MRXK | 1961 | ||||||||
| ODIN | GSVN | 1910 | ORESTES | GGMY | 1961 | OWEN | MRXK | 1964 | ||||||||
| ODIN | GVTR | 1939 | ORESTES | GGMY | 1964 | OWERA | BSBY | 1945-1948 | ||||||||
| ODIN | GDBE | 1961 | ORESTES | BJTD | 1945-1948 | OXFORD CASTLE | MZSN | 1956 | ||||||||
| ODIN | GDBE | 1964 | ORIANA | BJXT | 1945-1948 | OXFORD CASTLE | MZSN | 1945-1948 | ||||||||
| ODIN | QCKV | 1945-1948 | ORIANE (I.S.) | BTWX | 1945-1948 | OXFORDSHIRE | GLZF | 1945-1948 | ||||||||
| ODZANI | MRZR | 1956 | ORIANI (I.S.) | BTVY | 1945-1948 | OXLEY | GSBN | 1928 | ||||||||
| ODZANI | MRZR | 1945-1948 | ORIBI | GTBC | 1945-1948 | OXLIP | GQBS | 1945-1948 | ||||||||
| OFFA | GCJJ | 1945-1948 | ORIOLE | GYRJ | 1945-1948 | OXNA | MRYJ | 1945-1948 | ||||||||
| OFORDNESS | QDDG | 1945-1948 | ORION | GSWD | 1910 | OYSTERMOUTH CASTLE | GJRS | 1945-1948 | ||||||||
| OGANO | MLRN | 1945-1948 | ORION | GSWF | 1910 | |||||||||||
| OHM | GCJP | 1945-1948 | ORION | GVTV | 1939 |