Lao Khwan (, ) is a district (amphoe) in the northeastern part of Kanchanaburi province, central Thailand.
Laotian people moved to establish a new village in the area of Ban Ko Ban Kao. Later people from Bo Phloi moved to the area. When the government established a new town, they named it Ban Lao Khwan.<br> The minor district (king amphoe) Lao Khwan was created on 12 October 1971, when the three subdistricts (tambons) Lao Khwan, Nong Son, and Nong Pradu were split off from Phanom Thuan district. It was upgraded to a full district on 8 September 1976.
Neighboring districts are (from the south clockwise) Huai Krachao, Bo Phloi, Nong Prue of Kanchanaburi Province, Dan Chang, Nong Ya Sai, Don Chedi and U Thong of Suphanburi province.
The district is divided into seven subdistricts (tambons), which are further subdivided into 90 administrative villages (mubans).
As of December 2024 there are two municipal (thesaban) areas in the district: Lao Khwan and Nong Fai subdistrict municipalities (thesaban tambon) cover parts of the same-named subdistricts.
The non-municipal areas are administered by seven subdistrict administrative organizations - SAO (ongkan borihan suan tambon - o bo toh).
Lao Khwan district is served by one hospital
In the district there are thirteen health-promoting hospitals in total.
There are sixty-eight Theravada Buddhist temples in the district.
The Christians have two churches.