| Official Name: | Sam Chai |
| Native Name: | สามชัย |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Kalasin |
| Subdivision Type2: | Seat |
| Subdivision Name2: | Samran |
| Subdivision Type3: | Subdistrict |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Population Total: | 25,222 |
| Population As Of: | 2005 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 46180 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 4615 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 16.8633°N 103.5383°W |
Sam Chai (Thai: สามชัย, in Thai pronounced as /sǎːm t͡ɕʰāj/) is a district (amphoe) in the northern part of Kalasin province, northeastern Thailand.
Neighboring districts are (from the east clockwise): Kham Muang, Sahatsakhan, and Nong Kung Si of Kalasin Province and Wang Sam Mo of Udon Thani province.
The minor district (king amphoe) was created on 1 April 1995, when it was split off from Kham Muang district.[1]
On 15 May 2007, all 81 minor districts were upgraded to full districts.[2] With publication in the Royal Gazette on 24 August, the upgrade became official.[3]
The district is divided into four sub-districts (tambons), which are further subdivided into 46 villages (mubans). There are no municipal (thesaban) areas, and four tambon administrative organizations (TAO).
| No. | Name | Thai name | Villages | Pop. | ||
|---|---|---|---|---|---|---|
| 1. | Samran | สำราญ | 12 | 7,800 | ||
| 2. | Samran Tai | สำราญใต้ | 19 | 9,068 | ||
| 3. | Kham Sang Thiang | คำสร้างเที่ยง | 7 | 3,173 | ||
| 4. | Nong Chang | หนองช้าง | 8 | 5,181 |