Phon Na Kaeo (Thai: โพนนาแก้ว, pronounced [pʰōːn nāː kɛ̂ːw]) is a district (amphoe) of Sakon Nakhon province, northeast Thailand.

The minor district (king amphoe) was created on 1 April 1991, when the four tambons Ban Phon, Na Kaeo, Na Tong Watthana, and Ban Paen were split off from Mueang Sakon Nakhon district.

The district is divided into five sub-districts (tambons), which are further subdivided into 48 villages (mubans).

There are no municipal (thesaban) areas, and a further five tambon administrative organizations.

This Sakon Nakhon Province location article is a stub.