| Mana Ohyama | |
| Birth Date: | 7 December 1992 |
| Nationality: | Japanese |
| Height: | 1.65 m |
| Position: | Centre back |
| Currentclub: | Hokkoku Bank |
| Nationalteam1: | Japan |
| Nationalcaps1: | 39 |
| Nationalgoals1: | 93 |
Mana Ohyama (大山 真奈, Ōyama Mana; born 7 December 1992) is a Japanese handball player for Hokkoku Bank and the Japanese national team.
She participated at the 2017 World Women's Handball Championship.[1]