| O,Sea | 19 | RI0982R | 139362 | O'Connell, Daniel C. | B1 |
| O.B. | 24 | MS6558HB | 39831 | Mcclellan, William J. | SS |
| Obadiah | 26 | 912088 | 120603 | Page, Stephen G. | B1 |
| Ocean Boy | 74 | 544841 | 155439 | Ocean Boy, Inc | B2 |
| Ocean Eagle | 25 | 1143708 | 108930 | Stolnacke, Jonathan L. | B1 |
| Ocean Explorer | 59 | 905425 | 158415 | Main, George R. | B1 |
| Ocean Gold | 78 | 1037847 | 150185 | Ocean Gold Inc | ON |
| Ocean Hunter | 34 | 905607 | 139461 | Francis, Aaron M. | B1 |
| Ocean Hunter | 45 | 675834 | 1149 | Mello, Kevin M. | CL |
| Ocean Lady | 75 | 611992 | 149595 | Ocean Fishing Llc | B2 |
| Ocean Life | 34 | 1107832 | 2680 | Woollam, Gordon F. | CL |
| Ocean Master | 27 | MS1255AT | 157351 | Thomsom, Alexander W. | B1 |
| Ocean Pride | 79 | 973175 | 155209 | Ocean Pride, Inc. | ON |
| Ocean Pride Iii | 45 | NH7851BN | 156901 | King, Geordie H. | ON |
| Ocean Princess | 81 | 916992 | 150182 | Ocean Princess Inc | ON |
| Ocean Queen | 74 | 673713 | 150188 | Ocean Queen Inc | ON |
| Ocean Rancher | 44 | 595889 | 139214 | Ingham, Bruce W. | B1 |
| Ocean Reporter | 43 | 694848 | 3488 | Lee, Bill J. | OL |
| Ocean Runner | 36 | 1183183 | 143672 | Flannery, Richard C. | B1 |
| Ocean Scout | 20 | MS9531KS | 6974 | Eliopoulos, Michael G. | CL |
| Ocean Spray | 23 | MS4381BU | 138996 | Svenningsen, Glenn A. | CL |
| Ocean Spray | 38 | 541496 | 3597 | Cole, Howard A. | CL |
| Ocean Spray | 23 | MS4381BU | 153736 | Svenningsen, Glenn A. | B1 |
| Ocean Venture | 64 | 996362 | 151077 | Matthews, Barry | B2 |
| October Sky Iii | 20 | MS5392KK | 4278 | Prybot, Peter K. | CL |
| Odessa | 40 | 554354 | 149313 | Barrett, Timothy A. | B1 |
| Odin | 25 | MS3479KR | 1735 | Thomas, Baird M. | CL |
| Odon | 19 | MS6371AM | 139397 | Moceri, David P. | B1 |
| Odysea | 31 | 928787 | 139537 | Wilkins, Ralph J. | B1 |
| Odyssey | 14 | MS9899A | 17198 | Pickering, Robert P. | B1 |
| Odyssey | 38 | RI6794T | 154742 | Grey Dog Fisheries Inc | OL |
| Odyssey | 79 | 686108 | 150189 | Odyssey Scallop Co Inc | ON |
| Odyssey | 27 | MS5051LL | 62671 | Long, Leon E. | B1 |
| Off Duty | 22 | MS1199AD | 142376 | Dunn, Joseph A. | RR |
| Off Season | 24 | MS2496AV | 157706 | King, Alexis C. | B1 |
| Off The Bottom | 25 | MS9095AT | 5661 | Waitt, Joseph L. | CL |
| Offshore Angler | 26 | 1211181 | 157524 | Mathews, Michael T. | B1 |
| Offshore Lady | 72 | 1211815 | 158389 | Utterstrom, Adam J. | B2 |
| Offshorisle | 24 | MS4848AC | 158207 | Lecesse, Paul F. | B1 |
| Oh Baby | 34 | 595084 | 7061 | Stiles, Leslie H. | CL |
| Oh Buddy | 23 | MS42 | 155824 | Harris, Shawn M. | SL |
| Oil Burner | 36 | 651815 | 157953 | Dillworth, Richard S. | B1 |
| Ol Yella | 20 | MS5115HC | 151720 | Ingle, Harry C. | B1 |
| Old Dog | 34 | MS1373AR | 126173 | Britt, Joseph S. | B1 |
| Old Dog Ii | 25 | MS6279AR | 100251 | Eldridge, Thomas L. | B1 |
| Old Glory | 24 | MS9694AF | 147 | Foote, David F. | CL |
| Old Glory | 25 | MS9395AL | 126154 | Anderson, Edward C. | SS |
| Old Glory | 42 | 1210671 | 3735 | Piper Jr., David G. | CL |
| Old Glory | 25 | MS7238AS | 154214 | Rose, Jesse J. | B1 |
| Old Mystic | 59 | 250231 | 158667 | Neronha, James D. | B1 |
| Old Pro | 31 | 662243 | 131269 | Santos, James F. | B1 |
| Old School | 25 | MS9645KV | 4558 | Tamagini, Peter J. | CL |
| Old Squaw | 27 | 903934 | 4755 | Cullum, Stuart H. | CL |
| Old Squaw | 35 | 683088 | 2825 | Borges, Jay B. | CL |
| Old Squaw | 18 | MS2884AT | 100503 | Chartier, Paul C. | B1 |
| Old Timer | 14 | MS3661YY | 1484 | Lowell Jr., Ralph | CL |
| Oldsquaw | 17 | MS9308AT | 158535 | Perkins, Blair C. | B1 |
| Ole Yeller | 15 | MS7663AH | 142362 | Ashton, Gayle J. | IN |
| Olga Marie | 26 | 1094264 | 136414 | O'Rourke, Paul M. | B1 |
| Olivia & Rafaela | 71 | 553777 | 153495 | Olivia & Rafaela Fishing Llc | ON |
| Olivia Catherine | 72 | 533196 | 158402 | Reposa, Peter A. | ON |
| Olivia Madison | 39 | MS0813MM | 137870 | Mello Sr., Michael A. | CL |
| Olivia Nicole | 24 | MS2303KN | 109301 | Major, Raymond D. | B1 |
| Olympia | 83 | 684132 | 126465 | Salmon Falls Trawler, Inc. | OL |
| On Again | 24 | MS8707ZB | 150518 | Olival, Thomas | B1 |
| On My Own | 25 | MS9622R | 6360 | Allaire, Thomas B. | CL |
| On The Fly | 24 | MS0063RS | 139286 | Sigler, James R. | B1 |
| On The Fly | 26 | MS0124RC | 157096 | Crockett, Ronald H. | B1 |
| On The Pile | 17 | MS2553AN | 151512 | Avellar, Chad J. | B1 |
| On Time | 27 | MS5546ZE | 155053 | Kleinfeld, William L. | B1 |
| On Time | 31 | MS3459KN | 94191 | Koutalakis, Demetrios M. | B1 |
| Once Bitten | 21 | MS7123AF | 148931 | Mcdaid, Thomas J. | RR |
| Once Over | 20 | MS8599V | 3018 | Francoeur, Raymond E. | B1 |
| One Bad Larry | 23 | MS3705AL | 157716 | Brown, Laurence A. | B1 |
| One More Drift | 23 | 102102 | Fahey, Joseph T. | B1 | |
| One Particular | 20 | MS5919KM | 101962 | Baker Jr., Kenneth W. | B1 |
| One Shot | 23 | MS3274KN | 120987 | Hickey, Mark C. | B1 |
| Online | 25 | MS5972AR | 157139 | Pragana Iii, James | B1 |
| Opportunity | 21 | MS5325KA | 369 | Asher, Perry W. | CL |
| Orca | 28 | MS5864AL | 142317 | Seuss, Harry F. | RR |
| Orin C | 55 | 573869 | 988 | Williams, Louis D. | CL |
| Orion | 82 | 611248 | 150186 | Orion Venture Llc | ON |
| Orion | 77 | 1206267 | 158478 | Hudgens, Justin | B2 |
| Orion | 26 | 638987 | 74302 | Rindfleisch, Edward F. | B1 |
| Oscar B | 19 | MS0412AL | 152869 | Alster, Layne A. | B1 |
| Osprey | 35 | 932787 | 93804 | Corbett Jr., Stephen L. | B1 |
| Osprey | 40 | MS2568KN | 16651 | Smith, Robert F. | CL |
| Osprey | 24 | MS9517AN | 156897 | Fortin, Joey M. | B1 |
| Osprey | 23 | MS1086JZ | 120045 | Zacharias, Josh A. | B1 |
| Osprey | 108 | 683328 | 120027 | Irish Venture, Inc. | OL |
| Osprey | 26 | MS0041JB | 64536 | Bondorew, John | B1 |
| Osprey | 23 | MS4035AB | 126148 | Jenkinson, Patrick T. | B1 |
| Otter Ii | 20 | 2678 | Medeiros, Michael G. | B1 | |
| Ouija | 23 | MS7130BA | 138930 | Miszkin, Gerald S. | B1 |
| Our Island | 38 | 1173303 | 140257 | Besch, Rachel L. | B1 |
| Our Time | 56 | 926232 | 158449 | Our, Christopher W. | B1 |
| Out Numberer | 22 | MS4631KF | 155841 | Fyler, Walter S. | B1 |
| Out Of Bound | 26 | MS5014KM | 104003 | Chisholm, Philip A. | B1 |
| Out To Sea | 27 | 1171452 | 147072 | Spear, Curtis A. | B1 |
| Outcast | 23 | MS9431GK | 153742 | Hart, Adam G. | B1 |
| Outer Marker | 36 | 637853 | 4922 | Mccarthy, Sean P. | CL |
| Outlaw | 23 | MS9221AK | 157913 | Fedele, Todd | RR |
| Outlaw Iii | 32 | NH7519AU | 156578 | Law, Stephen R. | B1 |
| Outrage | 19 | MS4388AM | 150142 | Mak, Heang | B1 |
| Outrage | 31 | 961608 | 155495 | Zarella, Larry J. | B1 |
| Outrageous | 21 | MS5630AH | 146583 | Sanclemente, Charles G. | B1 |
| Outta Line | 23 | MS4695AM | 158058 | Valaskatgis, John M. | B1 |
| Ouzo | 20 | MS6144ZE | 151850 | Fondulis, Nick W. | B1 |
| Overtaker | 31 | 656940 | 7007 | Defilippo Ii, Antimo N. | CL |
| Overtaker | 36 | 1099764 | 156783 | Conroy, Mark S. | IN |
| Overtime | 35 | MS2249HH | 3683 | Haven, Harlan F. | CL |
| Owe Geezus | 17 | MS2738TT | 149219 | Svirsky, Thomas E. | B1 |