| Official Name: | Huai Mek |
| Native Name: | ห้วยเม็ก |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Kalasin |
| Subdivision Type2: | Seat |
| Subdivision Type3: | Subdistrict |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Population Total: | 49,716 |
| Population As Of: | 2005 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 46240 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 4608 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 16.59°N 103.2356°W |
Huai Mek (th|ห้วยเม็ก, pronounced as /th/; tts|ห้วยเม็ก, in Lao pronounced as /hùaj mèk/) is a district (amphoe) in the western part of Kalasin province, northeastern Thailand.
Neighboring districts are (from the northeast clockwise): Nong Kung Si and Yang Talat of Kalasin Province; Chuen Chom of Maha Sarakham province; and Kranuan of Khon Kaen Province.
The minor district (king amphoe) was created on 1 November 1970, when the three tambons, Huai Mek, Kut Don, and Bueng Na Riang were split off from Yang Talat district.[1] It was upgraded to a full district on 12 April 1977.[2]
The district is divided into nine sub-districts (tambons), which are further subdivided into 81 villages (mubans). There are two townships (thesaban tambons): Huai Mek and Kham Yai each cover parts of the same-named tambon. There are a further nine tambon administrative organizations (TAO).
| No. | Name | Thai name | Villages | Pop. | ||
|---|---|---|---|---|---|---|
| 1. | Huai Mek | ห้วยเม็ก | 12 | 9,094 | ||
| 2. | Kham Yai | คำใหญ่ | 12 | 7,306 | ||
| 3. | Kut Don | กุดโดน | 13 | 8,369 | ||
| 4. | Bueng Na Riang | บึงนาเรียง | 7 | 3,955 | ||
| 5. | Hua Hin | หัวหิน | 8 | 4,344 | ||
| 6. | Phimun | พิมูล | 7 | 4,149 | ||
| 7. | Kham Mueat Kaeo | คำเหมือดแก้ว | 9 | 5,788 | ||
| 8. | Non Sa-at | โนนสะอาด | 7 | 4,091 | ||
| 9. | Sai Thong | ทรายทอง | 6 | 2,620 |