Huai Krachao (, ) is a district (amphoe) in the eastern part of Kanchanaburi province, central Thailand.
Subdistricts Huai Krachao, Wang Phai, Don Salaep and Salong Ruea were separated from Phanom Thuan district and formed Huai Krachao minor district (king amphoe) on 26 May 1994. It was upgraded to a full district, published in Royal Gazette on 26 September 1997 and effective on 11 October 1997.
Neighboring districts are (from the south clockwise) Phanom Thuan, Bo Phloi, Lao Khwan of Kanchanaburi Province and U Thong of Suphanburi province.
The local waterway was called "Huai Kop Chao", because there were many frogs "Kop Chao". This name changed to "Huai Krachao" and so begame the name of the district.
The district is divided into four subdistricts (tambons), which are further subdivided into 73 administrative villages (mubans).
As of December 2024 there are two municipal (thesaban) areas in the district: Huai Krachao and Salong Ruea subdistrict municipalities (thesaban tambons) cover the whole subdistricts.
The non-municipal areas are administered by two subdistrict administrative organization - SAO (ongkan borihan suan tambon - o bo toh).
Huai Krachao district is served by one hospital
In the district there are six health-promoting hospitals in total.
There are thirty-two Theravada Buddhist temples in the district.
The Christians have three churches.