| Official Name: | Kasin |
| Native Name: | Persian: كاسين |
| Settlement Type: | Village |
| Pushpin Map: | Iran |
| Subdivision Type: | Country |
| Subdivision Name: | Iran |
| Subdivision Type1: | Province |
| Subdivision Name1: | East Azerbaijan |
| Subdivision Type2: | County |
| Subdivision Name2: | Varzaqan |
| Subdivision Type3: | District |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Ozomdel-e Jonubi |
| Population As Of: | 2016 |
| Population Total: | 2780 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Coordinates: | 38.5342°N 46.5975°W |
| Coordinates Footnotes: | [1] |
Kasin (Persian: كاسين) is a village in Ozomdel-e Jonubi Rural District of the Central District of Varzaqan County, East Azerbaijan province, Iran.
At the time of the 2006 National Census, the village's population was 1,917 in 430 households.[2] The following census in 2011 counted 2,178 people in 552 households.[3] The 2016 census measured the population of the village as 2,780 people in 840 households. It was the most populous village in its rural district.[4]