| Official Name: | Lam Thamenchai |
| Native Name: | ลำทะเมนชัย |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Nakhon Ratchasima |
| Subdivision Type2: | Seat |
| Subdivision Name2: | Khui |
| Subdivision Type3: | Subdistrict |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Population Total: | 32527 |
| Population As Of: | 2013 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 3029 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 15.3533°N 102.9183°W |
| Postal Code Type: | Postal code |
| Postal Code: | 30270 |
Lam Thamenchai (Thai: ลำทะเมนชัย, in Thai pronounced as /lām tʰā.mēːn.tɕʰāj/; ลำทะเมนชัย, in Lao pronounced as /la᷇m tʰā.me᷇ːn.sa᷇j/) is a district (amphoe) of Nakhon Ratchasima province, northeastern Thailand.
The area of Lam Thamenchai was separated from Chum Phuang district and made a minor district (king amphoe) on 15 July 1996.[1]
On 15 May 2007, all 81 minor districts were upgraded to full districts.[2] On 24 August the upgrade became official.[3]
Neighboring districts are (from the east clockwise): Khu Mueang and Lam Plai Mat of Buriram province; Chum Phuang and Mueang Yang of Nakhon Ratchasima Province.
The district is named after the Thamenchai River, the main river of the district.
The district is divided into four subdistricts (tambons). The township (thesaban tambon) of Nong Bua Wong covers parts of the tambons Kui and Phlai.
| 1. | Khui | ขุย | ||
| 2. | Ban Yang | บ้านยาง | ||
| 3. | Chong Maeo | ช่องแมว | ||
| 4. | Phlai | ไพล |