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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oates, Duggan | RP | Templeton Red Onions | 26 | 08/05/1879 | Manchester | ENG | Right | Right | 1.74 m | 81 kg | - |
| Ocampo, José | SP | Waterville Elms | 22 | 11/23/1882 | Río Grande | PUR | Right | Right | 1.76 m | 76 kg | - |
| Ochoa, Álvaro | LF | Derry Spuds | 24 | 09/10/1881 | San Juan | PUR | Right | Right | 1.78 m | 93 kg | - |
| Oliva, Gustavo | C | Falmouth Submersibles | 20 | 06/27/1885 | San Juan | PUR | Right | Right | 1.76 m | 78 kg | - |
| Olivares, Eufemio | CF | Mystic Drawbridges | 18 | 09/19/1887 | Añasco | PUR | Right | Right | 1.75 m | 68 kg | - |
| Oquendo, Édgar | 3B | Winchendon Rocking Horses | 32 | 09/07/1873 | Carolina | PUR | Right | Right | 1.75 m | 86 kg | - |
| Orea, Enrique | C | Mystic Drawbridges | 25 | 03/05/1880 | San Juan | PUR | Right | Right | 1.75 m | 94 kg | P720 |
| Orozco, Luis | SP | Newport Pilot Whales | 31 | 02/09/1874 | Ponce | PUR | Right | Right | 1.76 m | 81 kg | - |
| Orr, Hanrahan | RF | Free Agent | 29 | 05/06/1876 | Dublin | IRL | Right | Left | 1.72 m | 81 kg | - |
| Orr, Peter | LF | Griswold Vampires | 24 | 08/28/1881 | Cumbernauld | SCO | Left | Left | 1.83 m | 97 kg | - |
| Ortiz, Germán | LF | Lewiston Quebeckers | 33 | 02/18/1872 | Carolina | PUR | Left | Left | 1.80 m | 87 kg | - |
| Ortiz, Melquíades | RP | Newport Pilot Whales | 22 | 08/04/1883 | Florida | PUR | Left | Right | 1.79 m | 73 kg | - |
| Ortiz, Pablo | LF | Winchendon Rocking Horses | 18 | 11/01/1886 | Mayagüez | PUR | Left | Left | 1.77 m | 75 kg | - |
| Owens, Tubrady | LF | Nashua Gatekeepers | 23 | 03/09/1882 | Lisnaskea | NIR | Left | Left | 1.78 m | 85 kg | - |
| Oyler, Andy | 3B | Providence Gems | 25 | 05/05/1880 | Unknown | USA | Right | Right | 1.83 m | 66 kg | P500 |
