| Birth Place: | Zaporizhia, Ukrainian SSR, Soviet Union |
| Height: | 162 cm |
| Country: | Ukraine |
| Weight Class: | 48 kg |
| Worlds Rank: | 5 |
| Worlds Year: | 2015 |
| Worlds Weight: | Women's 48 kg |
| Regionals Type: | EU |
| Regionals Rank: | 3 |
| Regionals Year: | 2014 |
| Regionals Weight: | Women's 48 kg |
| Regionals Year2: | 2018 |
| Regionals Weight2: | Women's 48 kg |
| Olympics Rank: | R16 |
| Olympics Year: | 2016 |
| Olympics Weight: | Women's 48 kg |
| Updated: | 21 May 2023 |
Maryna Mikolaevna Cherniak (Ukrainian: Марина Миколаївна Черняк, born 26 March 1988) is a Ukrainian judoka.
Her twin sister Inna Cherniak is visually impaired, but competes in judo and sambo both against sighted and visually impaired people. To avoid competing against each other the sisters often split the events. For example, at the 2013 World Championships, Inna competed in the 52 kg and Maryna in the 48 kg division. At the 2013 Summer Universiade, both sisters won medals in the 52 kg category, but Inna in sambo and Maryna in judo. In 2016, Inna won a gold medal in judo at the 2016 Summer Paralympics, while Maryna was eliminated in her second bout at the 2016 Summer Olympics.