| Viečiūnai | |
| Settlement Type: | Town |
| Pushpin Map: | Lithuania |
| Pushpin Map Caption: | Location in Lithuania |
| Subdivision Type: | Country |
| Subdivision Name: |  Lithuania |
| Subdivision Type1: | Ethnographic region |
| Subdivision Name1: | Dzūkija |
| Subdivision Type2: | County |
| Subdivision Name2: | Alytus County |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Druskininkai municipality |
| Subdivision Type4: | Eldership |
| Subdivision Name4: | Viečiūnai Eldership |
| Subdivision Type5: | Capital of |
| Subdivision Name5: | Viečiūnai Eldership |
| Population As Of: | 2021[1] |
| Population Total: | 1788 |
| Coordinates: | 54.0611°N 24.0567°W |
| Timezone: | EET |
| Utc Offset: | +2 |
| Timezone Dst: | EEST |
| Utc Offset Dst: | +3 |
Viečiūnai is a small town in Alytus County in southern Lithuania. In 2021 it had a population of 1,788.