| Official Name: | Kut Bak |
| Native Name: | กุดบาก |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: |  Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Sakon Nakhon |
| Subdivision Type2: | Seat |
| Subdivision Name2: | Kut Bak |
| Subdivision Type3: | Subdistrict |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Established Date: | 1 |
| Population Total: | 31833 |
| Population As Of: | 2005 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 47180 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 4703 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 17.0872°N 103.8225°W |
Kut Bak (th|กุดบาก, pronounced as /th/) is a district (amphoe) of Sakon Nakhon province, Thailand.
Neighboring districts are (from the north clockwise) Nikhom Nam Un, Phanna Nikhom, Mueang Sakon Nakhon, and Phu Phan of Sakon Nakhon Province, Kham Muang of Kalasin province and Wang Sam Mo of Udon Thani province.
The minor district (king amphoe) was created on 1 February 1964, when three tambons, Kut Bak, Khok Phu, and Na Mong were split from Mueang Sakon Nakhon district.[1] It was upgraded to a full district on 14 November 1967.[2]
The district is divided into three sub-districts (tambons), which are further subdivided into 38 villages (mubans). Kut Bak is a township (thesaban tambon) which covers parts of tambon Kut Bak. There are a further three tambon administrative organizations (TAO).
| No. | Name | Thai name | Villages | Pop. | ||
|---|---|---|---|---|---|---|
| 1. | Kut Bak | กุดบาก | 10 | 10,687 | ||
| 3. | Na Mong | นาม่อง | 17 | 11,918 | ||
| 5. | Kut Hai | กุดไห | 11 | 9,228 |