| O T Marine | Olau Mark | Orr, Arthur |
| Oag, J. M. | Olau Syd | Orr, George N. |
| Oakbranch | Older | Osborne, A. W. |
| Oakes, Herbert K. | Olds, Irving S. | Osborne, F. M. |
| Oakglen | Oliver, Henry W. | Ostergotland |
| Oberstar, Hon James L. | Olympic Pride | Oswego Socony |
| Ocean View | Omega | Otco Bayway |
| Odanah | Ong | Otco New York |
| Ogdensburg | Onoko | Ottawa |
| Ogdensburg | Ontadoc | Otterburn Park |
| Oglebay Norton | Ontadoc | Ottercliffe Hall |
| Oglebay, Crispin | Ontario | Outarde |
| Oglebay, E. W. | Ontario No. 1 | Outarde |
| Oglebay, Earl W. | Ontario No. 1 | Outarde |
| O’Hagan, John J. | Ontario Power | Overniter |
| Ohl, Edwin N. | Orefax | Owego |
| Oil Transport | O’Reilly, Gen. Robt M. | Owen, Ira H. |
| Oil Transporter | Orion | Owen, John |
| Ojibway | Ormidale | Owendoc |
Great Lakes Vessel History
The Vessel Histories of Sterling Berry
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