is a district (amphoe) of Khon Kaen province, northeastern Thailand.
Originally named Ban Keng (บ้านเกิ้ง), the area was at first a subdistrict (tambon) of Chonnabot district. In 1928 the minor district (king amphoe) Ban Phai was established consisting of three subdistricts split off from Chonnabot.[1] It was upgraded to a full district on 1 February 1940.[2] In 1946 Chonnabot was downgraded to be a part of Ban Phai District, until it was reestablished in 1966.
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