| Fullname: | Svetlana Gennadievna Semova Demidenko |
| Nationality: | Russian |
| Sport: | Athletics Mountain running |
| Event: | Long-distance running |
| Birth Date: | 16 February 1976 |
| Birth Place: | Arzamas |
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Svetlana Demidenko born Semova (born 16 February 1976) is a Russian female long-distance runner and mountain runner who won 2002 World Mountain Running Championships[1] and two European Mountain Running Championships (2001, 2002). In 2004 she also won the Istanbul Marathon.