| Official Name: | Liasi |
| Native Name: | لياسی |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Gilan |
| Subdivision Type2: | County |
| Subdivision Name2: | Rudsar |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Rahimabad |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Siyarastaq Yeylaq |
| Population As Of: | 2006 |
| Population Total: | 74 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 36.7317°N 50.3678°W |
Liasi (Persian: لياسی, also Romanized as Līāsī) is a village in Siyarastaq Yeylaq Rural District, Rahimabad District, Rudsar County, Gilan Province, Iran. At the 2006 census, its population was 74, in 31 families.