At Samat (Thai: อาจสามารถ, pronounced [ʔàːt sǎː.mâːt]) is a district (amphoe) of Roi Et province, Thailand.

Neighboring districts are (from the north clockwise): Thawat Buri, Thung Khao Luang, Selaphum, Phanom Phrai, Suwannaphum, Mueang Suang, Chaturaphak Phiman (at a single point) and Mueang Roi Et.

[1] In January 2006 Prime Minister Thaksin Shinawatra chose At Samat as the model district for his poverty eradication program.

The event was shown as a reality TV show named Backstage: The Prime Minister.

The At Samat District is divided into 10 sub-districts (tambons), which are further subdivided into 139 administrative villages (mubans).