| Official Name: | Rattanawapi |
| Native Name: | รัตนวาปี |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Nong Khai |
| Subdivision Type2: | Seat |
| Subdivision Name2: | Rattanawapi |
| Subdivision Type3: | Subdistrict |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Population Total: | 36920 |
| Population As Of: | 2005 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 43120 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 4316 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 18.22°N 103.18°W |
Rattanawapi (th|รัตนวาปี) is a district (amphoe) of Nong Khai province, northeastern Thailand.
Neighboring districts are (from the east clockwise): Pak Khat and So Phisai of Bueng Kan province; Fao Rai and Phon Phisai of Nong Khai Province; and Bolikhamxai Province of Laos.
The minor district (king amphoe) was split off from Phon Phisai district on 1 April 1995.[1]
On 15 May 2007, all 81 minor districts were upgraded to full districts.[2] On 24 August the upgrade became official.[3]
The district is divided into five sub-districts (tambons), which are further subdivided into 61 villages (mubans). There are no municipal (thesaban) areas. There are five tambon administrative organizations (TAO).
| No. | Name | Thai name | Villages | Pop. | ||
|---|---|---|---|---|---|---|
| 1. | Rattanawapi | รัตนวาปี | 12 | 7,699 | ||
| 2. | Na Thap Hai | นาทับไฮ | 10 | 8,219 | ||
| 3. | Ban Ton | บ้านต้อน | 9 | 3,775 | ||
| 4. | Phra Bat Na Sing | พระบาทนาสิงห์ | 17 | 11,044 | ||
| 5. | Phon Phaeng | โพนแพง | 13 | 6,183 |