Bueng Kan, formerly Bung Kan (Thai: บึงกาฬ) is a small town and subdistrict (tambon) in Mueang Bueng Kan District, in Bueng Kan Province, far northeastern Thailand. It is the provincial and district capital and is located on the Mekong River, opposite the Laotian town of Pakxan of Bolikhamsai Province. As of 2010, it has a total population of 9,712 people and has jurisdiction over 11 villages. It lies on the junction of Highways 212 and 222, 136 kilometres northeast of Nong Khai and 750 kilometres northeast of Bangkok. The economy is based around agriculture with para rubber as the principal crop and tourism.

The settlement became a sanitary district in 1956. Like all sanitary district, it was upgraded to subdistrict municipality in 1999.

Bueng Kan was formerly part of Nong Khai Province until the formal establishment of the new province of the same name on March 23, 2011.