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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Day, Junior | C | Free Agent | 18 | 04/01/2018 | Brooklyn | USA | Switch | Right | 6' 6" | 210 lbs | - |
| O'Halloran, Mike | 3B | Free Agent | 18 | 04/15/2018 | Bellflower | USA | Right | Right | 6' 0" | 190 lbs | - |
| O'Kennedy, Bobby | CF | Free Agent | 18 | 10/24/2018 | Lancaster | USA | Left | Left | 6' 1" | 175 lbs | - |
| O'Mara, Anderson | RP | Philadelphia 1776 BC | 32 | 02/09/2004 | Iowa City | USA | Right | Right | 6' 4" | 220 lbs | $280,000 |
| O'Neal, Joe | SP | Free Agent | 22 | 05/09/2014 | Hillcrest | USA | Left | Left | 6' 1" | 195 lbs | - |
| Ocasio, Domingo | RP | Free Agent | 22 | 08/18/2014 | San Antonio | USA | Right | Right | 6' 0" | 185 lbs | - |
| Ogawa, Torajiro | CF | Charleston Battery | 22 | 07/13/2014 | Utsunomiya | JPN | Right | Right | 6' 4" | 190 lbs | $280,000 |
| Ohashi, Hiroshige | 2B | D.C. Divided | 18 | 01/11/2018 | Tokyo | JPN | Right | Right | 6' 4" | 185 lbs | - |
| Ojgibesov, Pavpv | C | Portland Evergreens | 17 | 01/31/2019 | Krasnoyarsk | RUS | Right | Right | 6' 6" | 205 lbs | - |
| Okubo, Kimi | 2B | D.C. Divided | 23 | 01/11/2013 | Kamojima | JPN | Right | Right | 6' 0" | 180 lbs | $280,000 |
| Oliver, George | C | Free Agent | 20 | 05/26/2016 | St. Charles | USA | Right | Right | 6' 1" | 205 lbs | - |
| Olsen, Marc | SP | Free Agent | 18 | 04/17/2018 | East Brunswick | USA | Right | Right | 6' 3" | 190 lbs | - |
| Olthof, Gerold | C | Philadelphia 1776 BC | 25 | 06/23/2011 | Veghel | NED | Right | Right | 6' 1" | 215 lbs | $280,000 |
| Oroto, Daniel | C | Free Agent | 25 | 12/17/2011 | San Juan | PUR | Right | Right | 6' 0" | 215 lbs | - |
| Orr, Ernest | 2B | Free Agent | 19 | 10/31/2017 | Fairfax | USA | Right | Right | 6' 2" | 185 lbs | - |
| Ortíz, Bartolo | CF | D.C. Divided | 18 | 08/15/2018 | Matayaya | DOM | Right | Right | 5' 9" | 165 lbs | - |
| Ortíz, Luis | SS | Philadelphia 1776 BC | 18 | 04/25/2018 | San Cristóbal | DOM | Left | Right | 6' 1" | 175 lbs | - |
| Ortíz, Pedro | RP | Las Vegas Flamingos | 38 | 09/10/1998 | Cumana | VEN | Left | Left | 6' 6" | 220 lbs | $1,050,000 |
| Oshiro, Orinosuke | SP | Mississippi Mockingbirds | 17 | 11/10/2019 | Tokyo | JPN | Left | Right | 6' 9" | 215 lbs | - |
| Osmond, Roy | 2B | Free Agent | 21 | 09/18/2015 | Winnipeg | CAN | Right | Right | 6' 0" | 195 lbs | - |
| Otero, Jorge | SP | Portland Evergreens | 29 | 08/06/2007 | Vado | USA | Left | Right | 6' 2" | 205 lbs | $20,700,000 |
| Otomo, Yajirobei | RP | Buckhead Bowties | 31 | 05/27/2005 | Unknown | JPN | Left | Left | 6' 8" | 235 lbs | $9,870,000 |
| Owens, Dave | SP | Free Agent | 18 | 03/22/2018 | Bensalem Township | USA | Right | Right | 5' 10" | 160 lbs | - |
| Owens, Walt | C | Free Agent | 24 | 12/15/2012 | Inglewood | USA | Left | Right | 6' 3" | 220 lbs | - |
