| Maria Yaina | |
| Fullname: | Mariya Nikolayevna Yayna |
| Birth Date: | 25 January 1982 |
| Birth Place: | Moscow, Soviet Union |
| Height: | 1.74m (05.71feet) |
| Weight: | 62kg (137lb) |
| Position: | driver |
| Years1: | ?-? |
| Clubs1: | SKIF-CSP Izmailovo |
| Nationalyears1: | ?-? |
| Nationalteam1: | Russia |
Mariya Nikolayevna Yayna (Мария Николаевна Яйна; born 25 January 1982) is a Russian female water polo player. She was a member of the Russia women's national water polo team, playing as a driver.
She was a part of the team at the 2004 Summer Olympics.[1] On club level she played for SKIF-CSP Izmailovo in Russia.