Phon Thong (Thai: โพนทอง, pronounced [pʰōːn tʰɔ̄ːŋ]) is a district (amphoe) in the northern part of Roi Et province, Thailand.

Neighboring districts are (from the east clockwise): Moei Wadi, Nong Phok, Selaphum, Pho Chai of Roi Et Province, and Kuchinarai of Kalasin province.

The area is famous for the Laem Phayom State Park and the Wat Pa Anantaram place of worship.

Another tambon was taken from Din Daeng District, which was abolished on the same day.

[3] The district is divided into 14 sub-districts (tambons), which are further subdivided into 190 villages (mubans).