Rattanawapi (Thai: 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.

[3] The district is divided into five sub-districts (tambons), which are further subdivided into 61 villages (mubans).

There are five tambon administrative organizations (TAO).

This Nong Khai Province location article is a stub.