| Official Name: | Chong Mek |
| Native Name: | ช่องเม็ก |
| Pushpin Map: | Thailand |
| Pushpin Label Position: | left |
| Pushpin Map Caption: | Location in Thailand |
| Pushpin Mapsize: | 250 |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Ubon Ratchathani Province |
| Subdivision Type2: | District |
| Subdivision Name2: | Amphoe Sirindhorn |
| Unit Pref: | Imperial |
| Population Blank1 Title: | Ethnicities |
| Population Blank2 Title: | Religions |
| Coordinates: | 15.1331°N 105.4669°W |
| Postal Code: | 34350 |
| Area Code: | 45 |
Chong Mek (Thai: ช่องเม็ก) is a border town in the Isan region of Thailand. It is located in the Sirindhorn District of Ubon Ratchathani Province, about 90km (60miles) east of Ubon Ratchathani. The town is the only land-based crossing open to most travellers from Thailand to Laos, the other such crossings being across the Mekong river.[1] Vang Tao is the settlement on the Lao side.
The town has a busy market popular with Thai visitors, however its popularity has diminished since the opening of the bridge at Mukdahan in 2007.[2]
About 50NaN0 west of Chong Mek is the large Sirindhorn Reservoir created by the construction of the Sirindhorn Dam in 1971.[1]