| Masanobu Okubo | |
| Position: | Pitcher |
| Birth Date: | 13 September 1976 |
| Birth Place: | Hidaka District, Wakayama, Wakayama, Japan |
| Bats: | Right |
| Throws: | Right |
| Debutleague: | NPB |
| Debutdate: | April 9 |
| Debutyear: | 2001 |
| Debutteam: | Orix BlueWave |
| Finalleague: | NPB |
| Finaldate: | May 29 |
| Finalyear: | 2010 |
| Finalteam: | Orix Buffaloes |
| Statyear: | 2010 |
| Statleague: | NPB |
| Stat1label: | Win–loss record |
| Stat1value: | 16-20 |
| Stat2label: | Saves |
| Stat2value: | 63 |
| Stat3label: | ERA |
| Stat3value: | 3.23 |
| Stat4label: | Strikeouts |
| Stat4value: | 276 |
| Teams: | |
| Awards: | |
| Update: | 8 February 2014 |
Masanobu Okubo (大久保 勝信; born September 13, 1976, in Hidaka District, Wakayama, Japan) is a former Nippon Professional Baseball pitcher.