Rattanaburi (Thai: รัตนบุรี, pronounced [rát.tā.ná(ʔ).bū.rī]) is a district (amphoe) in the northeastern part of Surin province, northeastern Thailand.

Neighboring districts are (from the south clockwise): Non Narai, Sanom and Tha Tum of Surin Province; Suwannaphum and Phon Sai of Roi Et province; and Rasi Salai, Bueng Bun, Pho Si Suwan and Mueang Chan of Sisaket province.

The district is divided into 12 sub-districts (tambons), which are further subdivided into 163 villages (mubans).

Missing numbers are tambon which now form Non Narai District.

This Surin Province location article is a stub.