| Official Name: | Mardasavas |
| Settlement Type: | Village |
| Pushpin Map: | Varėna District Municipality#Lithuania |
| Pushpin Label Position: | Location in Lithuania |
| Subdivision Name: |  Lithuania |
| Subdivision Type1: | County |
| Subdivision Name1: | Alytus County |
| Subdivision Type2: | Municipality |
| Subdivision Name2: | Varėna |
| Population As Of: | 2021 |
| Population Total: | 31 |
| Timezone: | EET |
| Utc Offset: | +2 |
| Timezone Dst: | EEST |
| Utc Offset Dst: | +3 |
| Coordinates: | 54.1511°N 24.3169°W |
Mardasavas is a village in Varėna district municipality, in Alytus County, in southeastern Lithuania. According to the 2011 census, the village has a population of 26 people.
Mardasavas village is located c. from Varėna, from Druskininkai, from Puvočiai (the nearest settlement).
The name Mardasavas comes from a personal name Lithuanian: Mardõsas, Mar̃dosa, Mardasas which correspondingly originates from Slavic personal names Belarusian: Мардас, Мордас, Маpдасевiч, Ukrainian: Мордас.[1]