| Atsiki | |
| Name Local: | Ατσική |
| Type: | municipal unit |
| Periph: | North Aegean |
| Periphunit: | Lemnos |
| Pop Municunit: | 2246 |
| Pop Community: | 818 |
| Population As Of: | 2021 |
| Area Municunit: | 134.7 |
| Coordinates: | 39.95°N 38°W |
| Licence: | MY |
Atsiki (Ατσική) is a village and a former municipality on the island of Lemnos, North Aegean, Greece. Since the 2011 local government reform it is part of the municipality Lemnos, of which it is a municipal unit.[1] It is located in the northern central part of the island and has a land area of 134.672 km²,[2] covering about 28.2% of the island's surface. The municipal seat was the town of Atsikí. Its next largest town is Ágios Dimítrios. The municipal unit's total population is 2,246 inhabitants (2021).