Suwannaphum (Thai: สุวรรณภูมิ, pronounced [sù.wān.nā.pʰūːm]) is a district (amphoe) of Roi Et province, in eastern Thailand.

It is named after the legendary country of Suwannaphum, which according to Thai tradition was on the Chao Phraya plain.

In 1718, the first Lao muang in the Chi valley—and indeed anywhere in the interior of the Khorat Plateau—was founded as Suwannaphum (in latter-day Roi Et Province) by an official in the service of King Nokasad of the Kingdom of Champasak, leading some 3,000 subjects.

Neighboring districts are (from the west clockwise): Kaset Wisai, Mueang Suang, At Samat, Phanom Phrai, Nong Hi, and Moei Wadi of Roi Et Province, and Rattanaburi and Tha Tum of Surin province.

The district is divided into 15 sub-districts (tambons), which are further subdivided into 195 villages (mubans).