| Official Name: | Chai Wan |
| Native Name: | ไชยวาน |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Udon Thani |
| Subdivision Type2: | Seat |
| Subdivision Name2: | Chai Wan |
| Subdivision Type3: | Tambon |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Population Total: | 38209 |
| Population As Of: | 2007 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 41290 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 4108 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 17.2867°N 103.2233°W |
Chai Wan (Thai: ไชยวาน, in Thai pronounced as /t͡ɕʰāj wāːn/) is a district (amphoe) in the southeastern part of Udon Thani province, northeastern Thailand.
Chai Wan district was a part of Nong Han district. It was created as a minor district (king amphoe) on 3 January 1977, when the two sub-districts Chai Wan and Nong Lak were detached from Nong Han District.[1] In 1979 the third sub-district, Kham Lo, was created[2] and the fourth sub-district Phon Sung transferred from Nong Han.[3] The minor district was upgraded to a full district on 1 February 1988.[4]
Neighboring districts are (from the south clockwise) Wang Sam Mo, Si That, Ku Kaeo, Nong Han of Udon Thani Province, Sawang Daen Din and Song Dao of Sakon Nakhon province.
The district is divided into four sub-districts (tambons), which are further subdivided into 51 villages (mubans). Chai Wan is a sub-district municipality (thesaban tambon) which covers parts of tambon Chai Wan. There are four tambon administrative organizations (TAO).
| No. | Name | Thai | Villages | Pop. | |
|---|---|---|---|---|---|
| 1. | Chai Wan | ไชยวาน | 17 | 13,121 | |
| 2. | Nong Lak | หนองหลัก | 12 | 10,011 | |
| 3. | Kham Lo | คำเลาะ | 11 | 7,980 | |
| 4. | Phon Sung | โพนสูง | 11 | 7,097 |