
| No. | Name | Comm. | Notes ( : Lost) |
| DD-450 | O'Bannon | 1942 | |
| DE-421 | O'Brien, Chester T. | 1944 | |
| DD-415 | O'Brien | 1940 | 19 Oct 42; torpedoed by I-15 during convoy to Guadalcanal |
| DD-725 | O'Brien | 1944 | |
| DE-340 | O'Flaherty | 1944 | |
| APA-90 | O'Hara, James | 1943 | |
| DD-889 | O'Hare | 1945 | |
| DE-188 | O'Neill | 1943 | |
| DE-330 | O'Reilly | 1943 | |
| DE-527 | O'Toole | 1944 | |
| SS-71 | O-10 | 1918 | |
| SS-63 | O-2 | 1918 | |
| SS-64 | O-3 | 1918 | |
| SS-65 | O-4 | 1918 | |
| SS-67 | O-6 | 1918 | |
| SS-68 | O-7 | 1918 | |
| SS-69 | O-8 | 1918 | |
| SS-70 | O-9 | 1918 | |
| PR-6 | Oaho | 1928 | 4 May 42; artillery fire at Corregidor |
| ARG-5 | Oahu | 1944 | |
| LSD-7 | Oak Hill | 1944 | |
| CL-95 | Oakland | 17 Jul 43 | |
| AK-56 | Oberon | 1942 | |
| AKA-14 | Oberon | 1943 | |
| DE-344 | Oberrender | 1944 | 9 May 45 -- by Kamikaze at Okinawa |
| AMc-91 | Observer | 1942 | |
| ACM-7 | Obstructor | 1945 | |
| AGS-3 | Oceanographer | 1942 | |
| ARB-2 | Oceanus | 1943 | |
| IX-110 | Ocelot | 1943 | |
| AOG-33 | Ochlockonee | 1944 | |
| AOG-34 | Oconee | 1945 | |
| APA-187 | Oconto | 1944 | |
| AF-26 | Octans | 1943 | |
| AF-46 | Octavia | 1945 | |
| IX-139 | Octorara | 1944 | |
| SS-484 | Odax | 1945 | |
| APD-71 | Odum | 1944 | |
| PF-37 | Ogden | 1944 | |
| AOG-35 | Ogeechee | 1944 | |
| ARG-1 | Oglala | 1943 | |
| CM-4 | Oglala | 1917 | |
| AKA-100 | Oglethorpe | 1945 | |
| ARS(T)-2 | Okala | 1945 | |
| APA-219 | Okaloosa | 1944 | |
| APA-200 | Okanogan | 1944 | |
| CL-91 | Oklahoma City | 22 Dec 44 | |
| BB-37 | Oklahoma | 2 May 16 | 7 Dec 1941; aerial torpedo at Pearl Harbor |
| AO-84 | Oklawaha | 1943 | |
| DE-417 | Oliver Mitchell | 1944 | |
| PYc-22 | Olivin | 1942 | |
| APA-188 | Olmsted | 1944 | |
| DE-765 | Olsen, Earl K. | 1944 | |
| IX-40 | Olympia | 1894 | |
| AGC-8 | Olympus, Mount | 1944 | |
| CL-4 | Omaha | 24 Feb 23 | |
| AP-152 | Omar Bundy, General | 1945 | |
| CVE-79 | Ommaney Bay | 11 Feb 44 | 4 Jan 45; bomb at Lingayen Gulf |
| APA-221 | Oneida | 1944 | |
| AN-85 | Oneota | 1945 | |
| WPG-79 | Onondaga | 1934 | |
| AVP-48 | Onslow | 1943 | |
| ATO-13 | Ontario | 1912 | |
| AOG-36 | Ontonagon | 1944 | |
| PYc-5 | Onyx | 1941 | |
| PYc-8 | Opal | 1941 | |
| AM-269 | Opponent | 1943 | |
| AM-103 | Oracle | 1943 | |
| PF-39 | Orange | 1943 | |
| AVP-49 | Orca | 1944 | |
| DD-617 | Ordronaux | 1943 | |
| CA-122 | Oregon City | 1945 | |
| AGP-10 | Orestes | 1944 | |
| ATO-136 | Oriole | 1942 | |
| AM-7 | Oriole | 1918 | |
| AS-18 | Orion | 1943 | |
| AP-24 | Orizaba | 1941 | |
| PF-43 | Orlando | 1944 | |
| DD-886 | Orleck | 1945 | |
| APA-49 | Ormsby | 1943 | |
| ASR-5 | Ortolan | 1936 | |
| IX-147 | Orvetta | 1944 | |
| LSV-3 | Osage | 1945 | |
| DE-538 | Osberg | 1945 | |
| APD-35 | Osmond Ingram | 1944 | |
| AVD-9 | Osmond Ingram | 1940 | |
| DD-255 | Osmund Ingram | 1919 | |
| DE-701 | Osmus | 1944 | |
| AM-56 | Osprey | 1940 | 6 Jun 44; mine in English Channel |
| WPG-50 | Ossipee | 1915 | |
| AKA-33 | Ostara | 1945 | |
| DE-164 | Osterhaus | 1943 | |
| AMc-51 | Ostrich | 1941 | |
| DE-767 | Oswald | 1944 | |
| AKA-101 | Ottawa | 1945 | |
| DE-210 | Otter | 1944 | |
| DE-244 | Otterstetter | 1943 | |
| ARG-20 | Otus | 1945 | |
| AS-20 | Otus | 1941 | |
| APD-23 | Overton | 1943 | |
| DD-239 | Overton | 1920 | |
| WPG-39 | Owasco | 1945 | |
| DD-536 | Owen | 1943 | |
| DD-776 | Owens, James C. | 1945 | |
| ATO-137 | Owl | 1942 | |
| AM-2 | Owl | 1918 | |
| APA-189 | Oxford | 1944 | |
| AGP-6 | Oyster Bay | 1943 | |
| LSV-2 | Ozark | 1944 |
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Last updated: March 3, 1997
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