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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Flahavan, Jimmy | SP | Mississippi Mockingbirds | 30 | 04/22/2005 | Queens | USA | Right | Right | 5' 10" | 180 lbs | $1,500,000 |
| O'Keefe, William | 1B | Chicago Gold Sox | 30 | 10/06/2005 | Belvidere | USA | Left | Left | 6' 1" | 240 lbs | $3,000,000 |
| O'Toole, Joe | 2B | Free Agent | 19 | 11/18/2016 | Eau Claire | USA | Right | Right | 6' 0" | 175 lbs | - |
| Ocasio, Domingo | RP | Free Agent | 21 | 08/18/2014 | San Antonio | USA | Right | Right | 6' 0" | 185 lbs | - |
| Ogasawara, Hirohisa | 2B | Chicago Gold Sox | 26 | 04/22/2009 | Yokohama | JPN | Right | Right | 6' 3" | 200 lbs | $2,200,000 |
| Ohashi, Hiroshige | 2B | D.C. Divided | 17 | 01/11/2018 | Tokyo | JPN | Right | Right | 6' 4" | 185 lbs | - |
| Ohayashi, Shigenobu | LF | Chicago Gold Sox | 26 | 06/07/2009 | Kamakura | JPN | Left | Left | 5' 10" | 190 lbs | $550,000 |
| Ohm, Jae-woo | LF | Boston Patriots | 17 | 12/05/2018 | Gongju | KOR | Switch | Right | 6' 7" | 210 lbs | - |
| Olsen, Doug | C | Free Agent | 19 | 10/10/2016 | Metuchen | USA | Right | Right | 6' 2" | 210 lbs | - |
| Olson, Dan | C | Free Agent | 19 | 07/01/2016 | Flower Mound | USA | Right | Right | 6' 1" | 205 lbs | - |
| Olvera, Félix | RF | D.C. Divided | 18 | 10/13/2017 | Ciudad Guayana | VEN | Right | Right | 6' 4" | 195 lbs | - |
| Oroto, Daniel | C | Free Agent | 24 | 12/17/2011 | San Juan | PUR | Right | Right | 6' 0" | 215 lbs | - |
| Orr, Ernest | 2B | Free Agent | 18 | 10/31/2017 | Fairfax | USA | Right | Right | 6' 2" | 185 lbs | - |
| Ortega, Álex | C | Boston Patriots | 17 | 06/01/2018 | Piedras Negras | MEX | Right | Right | 6' 1" | 195 lbs | - |
| Ortíz, Bartolo | CF | D.C. Divided | 17 | 08/15/2018 | Matayaya | DOM | Right | Right | 5' 9" | 160 lbs | - |
| Ortíz, Jesús | SP | Free Agent | 18 | 11/14/2017 | Arecibo | PUR | Right | Right | 6' 8" | 220 lbs | - |
| Ortíz, Pedro | RP | Las Vegas Flamingos | 37 | 09/10/1998 | Cumana | VEN | Left | Left | 6' 6" | 220 lbs | $1,050,000 |
| Otero, Jorge | SP | Portland Evergreens | 28 | 08/06/2007 | Vado | USA | Left | Right | 6' 2" | 205 lbs | $15,000,000 |
| Otomo, Yajirobei | RP | Buckhead Bowties | 30 | 05/27/2005 | Unknown | JPN | Left | Left | 6' 8" | 235 lbs | $9,870,000 |
| Oumar, Khadija | SP | Philadelphia 1776 BC | 18 | 12/20/2017 | Joal-Fadiouth | SEN | Right | Right | 6' 5" | 200 lbs | - |
| Owens, Artie | 2B | Free Agent | 18 | 03/18/2017 | Dennis | USA | Right | Right | 6' 3" | 185 lbs | - |
| Owens, Tim | SP | Free Agent | 18 | 09/10/2017 | Ottawa | USA | Right | Right | 6' 4" | 195 lbs | - |
| Owens, Walt | C | Free Agent | 23 | 12/15/2012 | Inglewood | USA | Left | Right | 6' 3" | 220 lbs | - |
| Ozezera, Jorge | 3B | Free Agent | 22 | 07/25/2013 | Queens | USA | Right | Right | 6' 4" | 220 lbs | - |
