| Official Name: | Soem Sai |
| Native Name: | เสริมซ้าย |
| Settlement Type: | Tambon |
| Subdivision Type: | Country |
| Subdivision Type2: | Province |
| Subdivision Name2: | Lampang |
| Subdivision Type3: | Amphoe |
| Subdivision Name3: | Soem Ngam District |
| Population As Of: | 2005 |
| Population Total: | 8492 |
| Timezone: | Thailand |
| Utc Offset: | +7 |
Soem Sai (Thai: เสริมซ้าย) is a village and tambon (subdistrict) of Soem Ngam District, in Lampang Province, Thailand.[1] In 2005 it had a total population of 8492 people. The tambon contains 10 villages.