| Last Name | First Name | Rank/Rate | Loss Date | Boat, Hull# | Cause |
|---|---|---|---|---|---|
| O'Brien | Forest L. | EM1 | 11-Oct-43 | WAHOO (SS-238) | Sunk in or near La Perouse Strait (Northern Japan) or along northwest coast of Honshu. |
| O'Brien | John J | MoMM2 | 26-Jul-44 | ROBALO (SS-273) | Sunk by mine 2 miles from west Coast of Palawan Island, RPI. |
| O'Brien | John P. | SM3 | 24-Jan-42 | S-26 (SS-131) | Sank after ramming by PC460 Gulf of Panama |
| O'Brien | Joseph A | BMC | 20-Mar-45 | KETE (SS-369) | Sunk somewhere between 29-38N 130-02E and Midway |
| O'Brien | Robert J. | F1 | 7-Nov-44 | ALBACORE (SS-218) | Sunk near 41° 49'N x 141° 11'E in channel between Hokkaido and Honshu |
| O'BrienJr. | Edmond F. | LT | 3-Oct-44 | SEAWOLF (SS-197) | Sunk just north of Morotai, between PI and Indonesia by USS Rowell |
| O'Connell | Bernard J | F1 | 1-Sep-43 | POMPANO (SS-181) | Sunk off the northeast coast of Honshu |
| O'Connell | EM | 10-Dec-41 | SEALION (SS-195) | Killed on board in bombing raid on Cavite | |
| O'ConnellJr. | John A. | MoMM1 | 1-Oct-44 | ESCOLAR (SS-294) | Sunk somewhere east of 33° 44'N x 127° 33'E |
| O'Connor | Mark A | EM3 | 20-Mar-45 | KETE (SS-369) | Sunk somewhere between 29-38N 130-02E and Midway |
| O'Donnell | Melvin B | RM3 | 1-Dec-43 | CAPELIN (SS-289) | Sunk off Celebes possibly off Kaoe Bay |
| O'Hara | Lloyd R | RT2 | 4-May-45 | LAGARTO (SS-371) | Sunk off Malay Coast in or near the Gulf of Siam. |
| O'Howell | Harry J | MoMMC | 1-Jun-44 | HERRING (SS-233) | Sunk within shore battery range of Point Tagan, Matsuwa Island, in Kuriles. |
| O'Meara | Thomas F | TM2 | 26-Feb-44 | GRAYBACK (SS-208) | Sunk near 25° 47'N x 128° 45'E south of Okinawa |
| O'Meara | William A | FC2 | 11-Jul-43 | RUNNER (SS-275) | Sunk north of Hokkaido |
| O'Neal | James W. | PhMC | 5-Mar-43 | GRAMPUS (SS-207) | Sunk in the Blackett Strait |
| O'Neal | Roy L. | EM3 | 11-Oct-43 | WAHOO (SS-238) | Sunk in or near La Perouse Strait (Northern Japan) or along northwest coast of Honshu. |
| O'Neal | Thomas E | TM2 | 1-Dec-43 | CAPELIN (SS-289) | Sunk off Celebes possibly off Kaoe Bay |
| O'Neil | Clinton F | LT(jg) | 1-Dec-43 | CAPELIN (SS-289) | Sunk off Celebes possibly off Kaoe Bay |
| O'Rourke | Edward P | F1 | 26-Jul-44 | ROBALO (SS-273) | Sunk by mine 2 miles from west Coast of Palawan Island, RPI. |
| O'Shields | Fred H. | EN? | 17-Dec-27 | S-4 (SS-109) | Sunk after collision with USCG Paulding off Provencetown, MA |
| O'Sullivan | C.D | LT(jg) | 15-Mar-43 | TRITON (SS-201) | Sunk somewhere between Rabaul and Shortlands Basin. |
| O'Toole | William P | EM3 | 18-Jun-45 | BONEFISH (SS-223) | Sunk in Toyama Wan |
| Oakley Jr. | Thomas B | CDR(CO) | 8-Nov-44 | GROWLER (SS-215) | Sunk in South China Sea |
| Ocumpaugh IV | Edmond | LT | 16-Nov-43 | CORVINA (SS-226) | Sunk just south of Truk |
| Oddo | Paul M. | EM3 | 4-Feb-45 | BARBEL (SS-316) | Sunk in southern entrance to Palawan Passage 7° 49.5' N x 116° 47.5' W . |
| Odening | Michael A. | LT(jg) | 2-Jun-68 | SCORPION (SSN-589) | Lost when submarine sank while in transit from Med. |
| Odom | Lester | F2 | 1-Jun-44 | HERRING (SS-233) | Sunk within shore battery range of Point Tagan, Matsuwa Island, in Kuriles. |
| Oeldemann | Henry C. | F2 | 9-Sep-43 | GRAYLING (SS-209) | Sunk in or near Tablas Strait, RPI |
| Oetting | Chesley C | EM2 | 10-Apr-63 | THRESHER (SSN-593) | Lost when submarine sank while on sea trials |
| Ogilvie | Harold B. | TM2 | 16-Feb-43 | AMBERJACK (SS-219) | Sunk off Rabaul |
| Ogilvie | Thomas D | S1 | 24-Aug-44 | HARDER (SS-257) | Sunk off Caiman Point near Bataan, RPI |
| Ogilvie | MM | 10-Dec-41 | SEALION (SS-195) | Killed on board in bombing raid on Cavite | |
| OhrtJr. | Charles N. | EMC | 12-Oct-43 | DORADO (SS-248) | Sunk in Western Atlantic, possibly near Cuba |
| Okerblom | Samuel | MoMM3 | 4-Feb-45 | BARBEL (SS-316) | Sunk in southern entrance to Palawan Passage 7° 49.5' N x 116° 47.5' W . |
| Olaguera | Francisco | OS2 | 3-Apr-43 | PICKEREL (SS-177) | Sunk within lume of Shiramuka Light off Honshu |
| Olds | Percy J. | OS2 | 10-Jan-43 | ARGONAUT (SS-166) | Sunk near Rabaul (05° 155'N x 153° 50'E) |
| Olexa | David E. | MoMM2 | 5-Mar-43 | GRAMPUS (SS-207) | Sunk in the Blackett Strait |
| Oliver | Paul C | TM3 | 16-Nov-43 | CORVINA (SS-226) | Sunk just south of Truk |
| Oliver | Robert G. | EM1 | 9-Sep-43 | GRAYLING (SS-209) | Sunk in or near Tablas Strait, RPI |
| Olsen | James P. L. | RT1 | 4-Feb-45 | BARBEL (SS-316) | Sunk in southern entrance to Palawan Passage 7° 49.5' N x 116° 47.5' W . |
| Olsen | Stanley R | MoMM1 | 1-Dec-43 | CAPELIN (SS-289) | Sunk off Celebes possibly off Kaoe Bay Nov 43 |
| Olson | Donald T | YN1 | 28-Mar-45 | TRIGGER (SS-237) | Sunk in area 32° 16'N to 30° 40'N by 132° 05'E to 127° 50'E. |
| Olson | Douglas H | MoMM2 | 18-Jun-45 | BONEFISH (SS-223) | Sunk in Toyama Wan |
| Olson | George C | S1 | 8-Apr-45 | SNOOK (SS-279) | Sunk in area within 100 miles east of 18° 40' N x 111° 39'E |
| Olson | Paul W | F1 | 6-Aug-45 | BULLHEAD (SS-332) | Sunk in west end of Lombok Strait. |
| Olson | Walter E. | S1 | 24-Oct-44 | SHARK (SS-314) | Sunk in channel midway between Hainan and Bashi Channel |
| Olvey | Russell B | YN2 | 15-Mar-43 | TRITON (SS-201) | Sunk somewhere between Rabaul and Shortlands Basin. |
| Ongerth | William R. | GM2 | 24-Oct-44 | SHARK (SS-314) | Sunk in channel midway between Hainan and Bashi Channel |
| Oothoudt | Marvin D. | RM1 | 24-Oct-44 | SHARK (SS-314) | Sunk in channel midway between Hainan and Bashi Channel |
| Opisso | Larry A | MoMM2 | 24-Aug-44 | HARDER (SS-257) | Sunk off Caiman Point near Bataan, RPI |
| Orfila | Harry F | QM3 | 12-May-44 | GUDGEON (SS-211) | Sunk off Saipan |
| Ortega | Howard E | F1 | 4-May-45 | LAGARTO (SS-371) | Sunk off Malay Coast in or near the Gulf of Siam. |
| Orth | Louis | SC1 | 8-Nov-44 | GROWLER (SS-215) | Sunk in South China Sea |
| Osborn | Berl C | SC3 | 3-Apr-43 | PICKEREL (SS-177) | Sunk within lume of Shiramuka Light off Honshu |
| Osborne | Robert W. | S1 | 3-Mar-42 | PERCH (SS-176) | Sunk along 100 fathom curve northeast of Kangean Island, Java |
| Osburn | Randall W | EM3 | 16-Nov-43 | CORVINA (SS-226) | Sunk just south of Truk |
| Oster | Laddie | SC1 | 28-Mar-45 | TRIGGER (SS-237) | Sunk in area 32° 16'Nto 30° 40'N by 132° 05'E to 127° 50'E. |
| Ostlund | William C | LT(jg) | 12-May-44 | GUDGEON (SS-211) | Sunk off Saipan |
| Ostrander | Edwin E. | MM3 | 11-Oct-43 | WAHOO (SS-238) | Sunk in or near La Perouse Strait (Northern Japan) or along northwest coast of Honshu. |
| Ottersen | Roy O | TM1 | 15-Mar-43 | TRITON (SS-201) | Sunk somewhere between Rabaul and Shortlands Basin. |
| Otto | Albert J. | TM3 | 12-Oct-43 | DORADO (SS-248) | Sunk in Western Atlantic, possibly near Cuba |
| Ouderkirk | D.M | MoMM3 | 4-Jul-44 | S-28 (SS-133) | Foundered off Hawaii |
| Ouelette | Emile A. | SA | 20-Jun-41 | O-9 (SS-70) | Foundered off Isle of Shoals 15 miles from Portsmouth NH; 42-59-48N, 70-20-27W. |
| Ouzts | Cleveland M. | MoMM1 | 16-Feb-43 | AMBERJACK (SS-219) | Sunk off Rabaul |
| Overbeek | Paul F | S1 | 6-Aug-45 | BULLHEAD (SS-332) | Sunk in west end of Lombok Strait. |
| Owen | Albert D | RM2 | 8-Nov-44 | GROWLER (SS-215) | Sunk in South China Sea |
| Owen | Jay S | SC1 | 1-Sep-43 | POMPANO (SS-181) | Sunk off the northeast coast of Honshu |
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