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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O, Ju-ho | LF | Andong HS Folk Warriors | 16 | 10/03/2026 | Chinyong | KOR | Switch | Right | 5' 11" | 155 lbs | - |
| O'Brien, Jake | RP | Point Grey HS Hounds | 15 | 11/08/2026 | Vancouver | CAN | Left | Right | 6' 6" | 200 lbs | - |
| O'Neill, Elmer | RP | Dedado HS Marines | 16 | 01/17/2026 | Talofofo | GUM | Left | Left | 6' 0" | 165 lbs | - |
| O'Neill, Rocky | CL | Dedado HS Marines | 16 | 02/26/2026 | Apra Harbor | GUM | Switch | Right | 6' 0" | 165 lbs | - |
| Oeltjen, Ronald | SP | Port Lincoln HS Trawlers | 17 | 02/02/2025 | Port Lincoln | AUS | Right | Right | 6' 4" | 190 lbs | - |
| Ogawa, Yoshi | 3B | Tennoji HS Sensei | 15 | 02/08/2027 | Nagoya | JPN | Right | Right | 6' 2" | 180 lbs | - |
| Ogura, Tsurayaki | C | Kochi HS Shogun | 16 | 12/13/2025 | Hiroshima | JPN | Right | Right | 6' 0" | 175 lbs | - |
| Okumura, Naomi | LF | Sendai Ikuei HS Daimyo | 16 | 01/14/2026 | Sendai | JPN | Left | Right | 6' 2" | 185 lbs | - |
| Oliveira, Santiago | RP | Matanzas HS El Poeta | 17 | 12/18/2024 | Havana | CUB | Left | Left | 6' 4" | 195 lbs | - |
| Ollson, Benjamin | RP | Rockingham HS Settlers | 17 | 10/31/2024 | Perth | AUS | Right | Right | 6' 0" | 165 lbs | - |
| Olson, Anthony | LF | Dunedin HS Scots | 16 | 01/28/2026 | Dunedin | NZL | Left | Left | 6' 3" | 185 lbs | - |
| Olson, Matt | 2B | Dublin Shamrocks | 17 | 04/19/2025 | Apple Valley | USA | Switch | Right | 6' 1" | 195 lbs | - |
| Olthof, Omer | RP | Hoorn Schooners | 17 | 01/18/2025 | Rijswijk | NED | Right | Right | 6' 3" | 175 lbs | - |
| On, Kyung-won | SP | Yeosu HS Porpoises | 16 | 03/08/2026 | Chonju | KOR | Right | Right | 6' 0" | 160 lbs | - |
| Onishi, Sadao | SP | Chiben HS Namami Samurai | 18 | 02/01/2024 | Kyoto | JPN | Right | Right | 6' 3" | 175 lbs | - |
| Ordóñez, Pepe | 2B | Matanzas HS El Poeta | 16 | 07/13/2026 | Havana | CUB | Left | Right | 6' 2" | 170 lbs | - |
| Ortíz, José | 3B | Manila HS Water Buffalo | 16 | 07/24/2026 | Santo Domingo | DOM | Right | Right | 5' 10" | 175 lbs | - |
| Ortíz, Pancho | CL | Jakarta HS Komodo Dragons | 17 | 02/12/2025 | Issaquah | USA | Right | Right | 6' 0" | 170 lbs | - |
| Ortíz, Pepe | RP | Guantanamo HS Diamond Cats | 17 | 01/18/2025 | Bayamo | CUB | Right | Right | 6' 8" | 200 lbs | - |
| Osborne, Reed | SP | Immaculata HS Stallions | 18 | 04/29/2024 | Enderby | CAN | Right | Right | 5' 10" | 155 lbs | - |
| Osterloh, Ruprecht | 1B | Hildegard Saints | 16 | 07/24/2026 | Dortmund | GER | Switch | Right | 6' 4" | 195 lbs | - |
| Ota, Ikki | RP | Tennoji HS Sensei | 15 | 01/28/2027 | Nagoya | JPN | Right | Left | 6' 2" | 175 lbs | - |
| Ota, Sugimoto | C | Osaka Toin HS Eijisu Masters | 17 | 10/03/2025 | Nagoya | JPN | Right | Right | 6' 2" | 205 lbs | - |
| Otto, Lou | SP | Hunting Hills HS Stags | 17 | 02/12/2025 | Edmonton | CAN | Right | Right | 6' 0" | 160 lbs | - |
| Ozaki, Yoshihito | RF | Tennoji HS Sensei | 16 | 11/14/2025 | Misaki | JPN | Left | Left | 6' 5" | 210 lbs | - |
